{"product_id":"seiko-the-league-5p31-7a40-chiffres-romains-plaque-or-1988","title":"Vintage Seiko The League Watch 5P31-7A40 — Roman Numerals (1988) ","description":"\u003cdiv style=\"margin: 28px 0; padding: 22px 12px; border-bottom: 1px solid #e2ddd5; text-align: center;\"\u003e\n\u003cp style=\"margin: 0 0 10px; font-size: 11px; letter-spacing: 0.18em; text-transform: uppercase; opacity: 0.5;\"\u003eAtelier Note\u003c\/p\u003e\n\u003cp style=\"margin: 0; font-style: italic; font-size: 16px; line-height: 1.7;\"\u003eTwelve black Roman numerals on a sandblasted dial, two concentric railway minute tracks, and five and a half millimetres thick. A Japanese dress watch from 1988, with a bezel bordered by fine beaded toothing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch2\u003eThe League: a 5.5mm Japanese dress watch with Roman numerals\u003c\/h2\u003e\n\u003cp\u003eThis \u003cstrong\u003ewatch Seiko\u003c\/strong\u003e belongs to the \u003cstrong\u003eThe League\u003c\/strong\u003e line, reference \u003cstrong\u003e5P31-7A40\u003c\/strong\u003e, dated \u003cstrong\u003e1988\u003c\/strong\u003e. It is a Japanese quartz dress watch, whose round \u003cstrong\u003egold-plated\u003c\/strong\u003e case with steel back measures \u003cstrong\u003e33mm in diameter\u003c\/strong\u003e and \u003cstrong\u003e5.5mm thick\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003ebezel\u003c\/strong\u003e is constructed in two levels: an outer edge worked in \u003cstrong\u003efine beaded toothing\u003c\/strong\u003e, then a polished inner ring descending at an angle toward the Crystal. The \u003cstrong\u003elugs\u003c\/strong\u003e are slim and short, and bring the watch to 39.5mm Lug-to-lug. At 5.5mm between the back and the Crystal, the piece slips under a shirt cuff without lifting it.\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003esilver-white dial\u003c\/strong\u003e has a sandblasted surface finish, which catches the light with a fine grain. Twelve \u003cstrong\u003eblack Roman numerals\u003c\/strong\u003e occupy the outer edge, framed by \u003cstrong\u003etwo concentric railway minute tracks\u003c\/strong\u003e surrounding the numeral zone. Below twelve o'clock, the mention \u003cem\u003eTHE LEAGUE\u003c\/em\u003e; above six o'clock, the signature \u003cem\u003eSEIKO\u003c\/em\u003e. At the bottom of the dial, the factory marking \u003cem\u003eJAPAN 5P31 7A30 D\u003c\/em\u003e.\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003ehour and minute hands\u003c\/strong\u003e are black and tapered, accompanied by a fine \u003cstrong\u003egold-tone centre seconds hand\u003c\/strong\u003e crossing the entire dial. The \u003cstrong\u003equartz\u003c\/strong\u003e movement, calibre Seiko 5P31, has been checked by our watchmakers, fitted with a new battery, and it carries a 1-year guarantee.\u003c\/p\u003e\n\u003ch3 style=\"margin: 40px 0 16px;\"\u003eThree points to note\u003c\/h3\u003e\n\u003cdiv style=\"margin: 20px 0; padding-left: 16px; border-left: 1px solid #e2ddd5;\"\u003e\n\u003cp style=\"margin: 0 0 4px; font-size: 12px; letter-spacing: 0.1em; opacity: 0.45;\"\u003e01\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 18px;\"\u003e\u003cstrong\u003e5.5mm thickness\u003c\/strong\u003e — an extra-flat proportion for a 33mm round case.\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 4px; font-size: 12px; letter-spacing: 0.1em; opacity: 0.45;\"\u003e02\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 18px;\"\u003e\u003cstrong\u003eTwo-level bezel\u003c\/strong\u003e — beaded toothing on the outside, angled polished ring on the inside.\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 4px; font-size: 12px; letter-spacing: 0.1em; opacity: 0.45;\"\u003e03\u003c\/p\u003e\n\u003cp style=\"margin: 0;\"\u003e\u003cstrong\u003eSigns of wear on the bezel\u003c\/strong\u003e — fine scratches on the outer edge, detailed in the Overall condition bullet point.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3 style=\"margin: 40px 0 16px;\"\u003eWhy choose this vintage Seiko?\u003c\/h3\u003e\n\u003cp\u003eThis \u003cstrong\u003epre-owned Seiko watch\u003c\/strong\u003e holds a precise place among our \u003cstrong\u003evintage watches\u003c\/strong\u003e  : The League is a dress line from the Japanese catalogue of Seiko, never distributed in Europe through official channels. This variant combines a Roman numeral dial, a finely beaded bezel, and a height of 5.5mm — a figure that few gold-plated round watches of this diameter achieve. The 18mm Lug width, an even size among the most common, leaves plenty of choice for leather.\u003c\/p\u003e\n\u003cp\u003eLike all our \u003cstrong\u003epre-owned luxury watches\u003c\/strong\u003e, this one has been opened and checked by our partner watchmakers: movement verification, examination of the dial, hands and case. Every \u003cstrong\u003evintage Seiko watch\u003c\/strong\u003e we offer comes with an Atelier Victor invoice serving as a certificate, a 1-year guarantee, and guaranteed lifetime authenticity.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e→ \u003ca href=\"\/en\/collections\/montres-seiko-vintage\" title=\"Vintage Seiko Watches\"\u003eDiscover our vintage Seiko watches\u003c\/a\u003e\u003cbr\u003e→ \u003ca href=\"\/en\/collections\/montres-vintage-japonaises\" title=\"Vintage Japanese Watches\"\u003eSee our vintage Japanese watches\u003c\/a\u003e\u003c\/em\u003e\u003c\/p\u003e\n\u003ch3 style=\"margin: 40px 0 16px;\"\u003eTechnical specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand :\u003c\/strong\u003e Seiko\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel :\u003c\/strong\u003e The League\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReference :\u003c\/strong\u003e 5P31-7A40\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEstimated year :\u003c\/strong\u003e 1988\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSerial number :\u003c\/strong\u003e 82••••\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrigin :\u003c\/strong\u003e Japan\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGender :\u003c\/strong\u003e Men's watch, women's watch (Unisex)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMovement :\u003c\/strong\u003e Quartz, Seiko calibre 5P31\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFunctions :\u003c\/strong\u003e Hours, minutes, seconds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCase :\u003c\/strong\u003e Gold-plated (steel back), round shape, bezel with fine beaded edging and chamfered inner ring\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDiameter :\u003c\/strong\u003e 33mm (34.5mm with the crown)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLug-to-lug :\u003c\/strong\u003e 39.5mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThickness :\u003c\/strong\u003e 5.5mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLug width :\u003c\/strong\u003e 18mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCrown :\u003c\/strong\u003e Gold-tone, original\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDial :\u003c\/strong\u003e Sandblasted silver-white, black Roman numerals, two concentric railway minute tracks, THE LEAGUE and SEIKO mentions, JAPAN 5P31 7A30 D marking, original\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHands :\u003c\/strong\u003e Slim black hands, gold-tone centre seconds, original\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCrystal :\u003c\/strong\u003e Mineral (condition 9\/10)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStrap :\u003c\/strong\u003e Black crocodile-embossed leather, not original\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuckle :\u003c\/strong\u003e Steel pin buckle, not original\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"margin: 40px 0 16px;\"\u003eCondition and guarantee\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall condition :\u003c\/strong\u003e Good state of preservation. The sandblasted dial is clear: Roman numerals, railway minute tracks and mentions perfectly printed, hands without alteration. Crystal mineral in good condition (9\/10). The gold plating shows fine surface scratches from wear around the bezel and a few marks on the lugs, visible in our photographs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWater resistance :\u003c\/strong\u003e Not guaranteed (vintage watch)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAuthenticity :\u003c\/strong\u003e Lifetime guarantee\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMechanics :\u003c\/strong\u003e Checked and functional quartz movement, new battery, 1-year guarantee\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded :\u003c\/strong\u003e Atelier Victor invoice, protective case\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot included :\u003c\/strong\u003e Original box and papers\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"margin: 40px 0 16px;\"\u003eFrequently asked questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the The League line from Seiko?\u003c\/strong\u003e \u003cbr\u003eIt is a series of dress watches that Seiko intended for its Japanese market, identifiable by the words THE LEAGUE printed below 12 o'clock. It brings together classically styled dials — Roman or calligraphic numerals, railway minute tracks — with slim cases and quartz movements. It was produced with several calibres, including the 2G28 and the 5P31.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does the reference 5P31-7A40 mean?\u003c\/strong\u003e\u003cbr\u003eSeiko references are read in two parts: the first, here 5P31, designates the movement calibre; the second, 7A40, the case code, engraved on the caseback. The dial bears a distinct code, here 7A30, which identifies the dial alone. The caseback takes precedence over the dial in establishing a piece's reference.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs a watch measuring 5.5mm thick fragile?\u003c\/strong\u003e\u003cbr\u003eNo, but it requires the same care as any older dress watch. The slimness comes from the quartz calibre and a very flat caseback; the case remains a rigid whole. This format can be worn daily while avoiding direct knocks, and it is rather the Crystal and the plating that show wear before the structure.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow should a gold-plated case be cared for?\u003c\/strong\u003e\u003cbr\u003eThe plating is a layer of gold deposited on a base metal: it becomes thinner at points of friction, mainly the bezel edges and the lugs. It is preserved by avoiding water, household products and cosmetics, and is cleaned with a soft, dry cloth, never with an abrasive or a polishing paste, which remove the layer.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs this piece suitable for a slim or larger wrist?\u003c\/strong\u003e\u003cbr\u003eWith a 33mm diameter, 39.5mm Lug-to-lug and 5.5mm thickness, it suits wrists of around 15 to 18cm — a guide, never a rule: everyone wears what they like. Its short lugs prevent any overhang on a slim wrist, and its thinness lets it slip under any cuff.\u003c\/p\u003e\n \u003cscript type=\"application\/ld+json\"\u003e\n{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Qu'est-ce que la ligne The League de Seiko ?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"C'est une série de montres habillées que Seiko destine à son marché japonais, identifiable à la mention THE LEAGUE imprimée sous midi. Elle rassemble des cadrans d'écriture classique — chiffres romains ou calligraphiés, minuteries chemin de fer — sur des boîtiers minces et des mouvements à quartz. Elle a été déclinée sur plusieurs calibres, dont le 2G28 et le 5P31.\"}}, {\"@type\": \"Question\", \"name\": \"Que signifie la référence 5P31-7A40 ?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Les références Seiko se lisent en deux parties : la première, ici 5P31, désigne le calibre du mouvement ; la seconde, 7A40, le code du boîtier, gravé au fond de boîte. Le cadran porte un code distinct, ici 7A30, qui identifie le cadran seul. Le fond de boîte fait autorité sur le cadran pour établir la référence d'une pièce.\"}}, {\"@type\": \"Question\", \"name\": \"Une montre de 5,5mm d'épaisseur est-elle fragile ?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Non, mais elle demande la même attention que toute habillée ancienne. La minceur vient du calibre à quartz et d'un fond très plat ; le boîtier reste un ensemble rigide. Ce format se porte au quotidien en évitant les chocs directs, et ce sont plutôt le verre et le plaquage qui marquent avant la structure.\"}}, {\"@type\": \"Question\", \"name\": \"Comment entretenir un boîtier plaqué or ?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Le placage est une couche d'or déposée sur un métal de base : elle s'amincit aux points de frottement, principalement les arêtes de la lunette et les cornes. Elle se conserve en évitant l'eau, les produits ménagers et les cosmétiques, et se nettoie au chiffon doux et sec, jamais avec un abrasif ni une pâte à polir, qui retirent la couche.\"}}, {\"@type\": \"Question\", \"name\": \"Cette pièce convient-elle à un poignet fin ou large ?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Avec 33mm de diamètre, 39,5mm de corne à corne et 5,5mm d'épaisseur, elle se place sur des poignets de 15 à 18cm environ — un repère, jamais une règle : chacun porte ce qui lui plaît. Ses cornes courtes lui évitent tout débord sur un poignet fin, et sa finesse la fait passer sous toutes les manchettes.\"}}]}\n\u003c\/script\u003e  ","brand":"Seiko","offers":[{"title":"Default Title","offer_id":54639451439441,"sku":"822607 5P31-7A40","price":393.75,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0703\/8576\/2597\/files\/montre-seiko-the-league-5p31-7a40-chiffres-romains-plaque-or-1988-atelier-victor-1.jpg?v=1789672309","url":"https:\/\/ateliervictor.co\/en\/products\/vintage-seiko-the-league-watch-5p31-7a40-roman-numerals-1988","provider":"Atelier Victor","version":"1.0","type":"link"}