{"product_id":"montre-seiko-tank-plaque-or-5p31-5d40-1988","title":"Vintage Seiko Tank Gold-Plated —  5P31-5D40 (1988) ","description":"\u003ch2\u003eSeiko rectangular gold-plated: the ultra-thin Japanese dress watch with a gilded dial\u003c\/h2\u003e\n\u003cp\u003eThis Seiko watch is a \u003cstrong\u003edress watch\u003c\/strong\u003e designed for both women and men, conceived in the classic vocabulary of the shaped watch. Its \u003cstrong\u003erectangular case\u003c\/strong\u003e, gold-plated, with polished flanks and slender lugs, favors wardrobe elegance rather than presence. The case measures 24mm (25mm with the crown) for a Lug-to-lug of 33mm and a thickness of only 5.9mm, Crystal included. A slim piece, made to slip under a shirt cuff.\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003egilded dial\u003c\/strong\u003e has, over time, taken on a marbled patina that gives it the character of a lived-in piece rather than the smoothness of a new dial. Applied gilded baton indexes punctuate the periphery, doubled at 12 o'clock, and two fine \u003cstrong\u003efaceted hands\u003c\/strong\u003e are sufficient for the display: no seconds hand, no date. The Seiko signature occupies the top of the dial, the reference engraving the bottom. It is a two-handed watch, as pared down as possible.\u003c\/p\u003e\n\u003cp\u003eInside beats the \u003cstrong\u003eSeiko calibre 5P31\u003c\/strong\u003e, an analog quartz movement produced in Japan from 1987 onward, used on the brand's dress lines. Its slim construction, without a seconds train, is precisely what allows the watch's 5.9mm profile. The movement of this example has been checked by our watchmaker and the battery replaced before shipment. Seiko has not published a precision specification for this calibre: we therefore make no numerical claim.\u003c\/p\u003e\n\u003cp\u003eOn the wrist, the piece behaves like a \u003cstrong\u003ede ville jewel\u003c\/strong\u003e. The warm gold plating and compact format place it in the register of tuxedo watches, here enhanced by a \u003cstrong\u003egenuine crocodile leather\u003c\/strong\u003e deep green strap that contrasts beautifully with the gilded case. This strap is not original; it is fitted with a steel pin buckle. The Lug width of 19mm leaves every possibility of changing it.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThree points to note\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThe gilded dial shows a marbled patina and diffuse signs of oxidation, visible up close: an age mark that we prefer to disclose rather than embellish.\u003c\/li\u003e\n\u003cli\u003eThe 5P31 calibre is no longer produced: movement parts are becoming harder to find, but a battery change remains a routine operation for any watchmaker.\u003c\/li\u003e\n\u003cli\u003eThe case is gold-plated, not solid gold: it calls for avoiding repeated friction against a bracelet or a Buckle buckle.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003e→ \u003ca href=\"\/en\/collections\/montres-seiko-vintage\"\u003eDiscover our Seiko vintage watches\u003c\/a\u003e\u003cbr\u003e→ \u003ca href=\"\/en\/collections\/montres-vintage-moins-500\"\u003eSee our vintage watches under €500\u003c\/a\u003e\u003c\/em\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\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 Rectangular dress watch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReference:\u003c\/strong\u003e 5P31-5D40\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSerial number:\u003c\/strong\u003e 840xxx\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eYear:\u003c\/strong\u003e 1988 (April)\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 and women's watch (Unisex)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMovement:\u003c\/strong\u003e Japanese quartz, Seiko calibre 5P31\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFunctions:\u003c\/strong\u003e Hours, minutes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCase:\u003c\/strong\u003e Gold-plated (steel case back), rectangular shape\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 24mm (25mm with the crown)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLug to lug:\u003c\/strong\u003e 33mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThickness:\u003c\/strong\u003e 5.9mm (Crystal included)\u003c\/li\u003e \n\u003cli\u003e\n\u003cstrong\u003eLug width :\u003c\/strong\u003e 19mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCrown :\u003c\/strong\u003e Gold-plated, fluted, original\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDial :\u003c\/strong\u003e Gilt with mottled patina, applied gilt baton indices, original\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHands :\u003c\/strong\u003e Faceted gilt baton hands (hours, minutes), original\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCrystal :\u003c\/strong\u003e Mineral, very good condition\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBracelet :\u003c\/strong\u003e Genuine green crocodile leather, not original\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuckle :\u003c\/strong\u003e Steel buckle, not original\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCondition and warranty\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall condition :\u003c\/strong\u003e Good condition. Case with a uniform gold-plated finish, with some wear along the edges. The gilt dial, however, shows a mottled patina and diffuse signs of oxidation, consistent with the age of the piece and accepted as such.\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\u003eMechanical :\u003c\/strong\u003e Checked quartz movement, new battery, guaranteed for 1 year\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\u003chr\u003e\n\u003ch3\u003eFrequently asked questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eIs this rectangular Seiko a Cartier?\u003c\/strong\u003e\u003cbr\u003eNo. This is an authentic Seiko, signed on the dial and engraved with its reference 5P31-5D40. The rectangular gold-plated case with gilt dial belongs to the common vocabulary of dress watches from the 1980s, adopted by many Japanese and Swiss houses. This piece claims nothing other than what it is, and the authenticity of its brand is guaranteed for life by Atelier Victor.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs the Seiko 5P31 caliber reliable?\u003c\/strong\u003e\u003cbr\u003eYes. The 5P31 is an analog quartz movement produced in Japan from 1987 for Seiko dress watches. Its simple two-hand construction makes it durable, and in practice servicing is limited to battery replacement. The movement of this example has been checked by our watchmaker and is guaranteed for 1 year.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs dial patina a defect?\u003c\/strong\u003e\u003cbr\u003eNo, it is a trace of time. On vintage gilt dials, oxidation over the years creates marbling and nuances that give the piece its character. We disclose it with full transparency: it is up to you to appreciate this dial for what it is, a lived-in surface, not a refinished dial. This patina has no effect on the watch's performance.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs this Seiko 5P31-5D40 water-resistant?\u003c\/strong\u003e\u003cbr\u003eNo. Water resistance is never guaranteed on a vintage watch: the original seals have aged and the pressure of the caseback is no longer what it once was. Avoid the shower, the pool, and the sea. A simple contact with rainwater, however, does not pose any difficulty.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes a 24mm rectangular case suit which wrist?\u003c\/strong\u003e\u003cbr\u003eOn a rectangular watch, it is the Lug-to-lug that matters: 33mm here, which places the piece on wrists from 14 to 18 cm. It is the classic format of the shaped dress watch: discreet on a masculine wrist, perfectly proportioned on a feminine wrist. Its 5.9mm thickness allows it to slip under a cuff.\u003c\/p\u003e\n\u003cp\u003e\u0026nbsp;\u003c\/p\u003e ","brand":"Seiko","offers":[{"title":"Default Title","offer_id":54188692799825,"sku":"840234 5P31-5D40","price":315.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0703\/8576\/2597\/files\/VD_04370.jpg?v=1783871322","url":"https:\/\/ateliervictor.co\/en\/products\/vintage-seiko-tank-gold-plated-5p31-5d40-1988","provider":"Atelier Victor","version":"1.0","type":"link"}