{"product_id":"2025-jaeger-lecoultre-master-ultra-thin-reserve-de-marche","title":"2025 Jaeger-LeCoultre Master Ultra Thin Réserve de Marche","description":"\u003ch1 style=\"margin:0\"\u003eJaeger-LeCoultre Master Ultra Thin Réserve de Marche 39mm — Ref. Q1378421\u003c\/h1\u003e\u003ch1 style=\"margin:0\"\u003e\u003cbr\u003e\u003c\/h1\u003e\u003cp style=\"margin:0\"\u003eVideo footage available upon request. Open to offers.\u003c\/p\u003e\u003cp style=\"margin:0\"\u003e\u003cbr\u003e\u003c\/p\u003e\u003cp style=\"margin:0\"\u003eThe Master Ultra Thin collection is where Jaeger-LeCoultre shows what it can do when thinness is the entire design brief — and the Réserve de Marche proves that \"ultra thin\" doesn't have to mean \"stripped down.\" This 39mm case manages to house an in-house automatic caliber with a date display, small seconds, and a power reserve indicator while staying slim enough to slide under any cuff without a fight. The updated Caliber 938 brings a silicon escapement to the equation, which does two things that matter: it improves long-term accuracy by resisting magnetic fields, and it extends the power reserve to a full 70 hours — nearly three days off the wrist from a movement this thin. The silver-grey sunray dial catches light in a way that shifts between warm silver and cool steel depending on the angle, with dauphine hands and elongated stick markers that keep the layout clean despite three complications sharing the dial. The power reserve indicator sits opposite the small seconds, balanced around a date window at 3 o'clock, and the whole arrangement reads as effortless rather than crowded. Through the sapphire exhibition caseback, the finishing on the 938 is on full display — this is a manufacture movement from a brand that's been building them since 1833, and it looks the part. At 39mm on a black alligator strap with a double-folding clasp, this is the kind of watch that makes everything else on your wrist feel loud.\u003c\/p\u003e\u003cp style=\"margin:0\"\u003e\u003cbr\u003e\u003c\/p\u003e\u003cp style=\"margin:0\"\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/p\u003e\u003cp style=\"margin:0\"\u003e\u003cbr\u003e\u003c\/p\u003e\u003cul style=\"margin:0;padding-left:1.5em\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e Master Ultra Thin Réserve de Marche\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReference:\u003c\/strong\u003e Q1378421\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCaliber:\u003c\/strong\u003e Jaeger-LeCoultre 938 — 41 jewels, 28,800 vph (4 Hz), in-house manufacture, automatic, silicon escapement\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCase Material:\u003c\/strong\u003e Stainless Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCase Diameter:\u003c\/strong\u003e 39mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCase Thickness:\u003c\/strong\u003e 8.95mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLug Width:\u003c\/strong\u003e 21mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBezel:\u003c\/strong\u003e Stainless steel, fixed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCrystal:\u003c\/strong\u003e Sapphire with anti-reflective treatment\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCaseback:\u003c\/strong\u003e Sapphire crystal exhibition\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDial:\u003c\/strong\u003e Silver-grey sunray-brushed, dauphine hands, elongated stick hour markers\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStrap:\u003c\/strong\u003e Black alligator leather with stainless steel double-folding clasp\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMovement:\u003c\/strong\u003e Automatic\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComponents:\u003c\/strong\u003e 273\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Reserve:\u003c\/strong\u003e 70 hours\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWater Resistance:\u003c\/strong\u003e 50 meters (5 bar)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFunctions:\u003c\/strong\u003e Hours, minutes, small seconds, date (3 o'clock), power reserve indicator\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp style=\"margin:0\"\u003e\u003cbr\u003e\u003c\/p\u003e\u003cp style=\"margin:0\"\u003e\u003cstrong\u003eCondition Report\u003c\/strong\u003e\u003c\/p\u003e\u003cp style=\"margin:0\"\u003e\u003cbr\u003e\u003c\/p\u003e\u003cul style=\"margin:0;padding-left:1.5em\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eCase:\u003c\/strong\u003e 10\/10\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBezel:\u003c\/strong\u003e 10\/10\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCrystal:\u003c\/strong\u003e 10\/10\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDial\/Hands:\u003c\/strong\u003e 10\/10\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStrap:\u003c\/strong\u003e 10\/10\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClasp:\u003c\/strong\u003e 10\/10\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCaseback:\u003c\/strong\u003e 10\/10\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp style=\"margin:0\"\u003e\u003cbr\u003e\u003c\/p\u003e\u003cp style=\"margin:0\"\u003e\u003cstrong\u003ePolishing Status:\u003c\/strong\u003e Unpolished\u003c\/p\u003e\u003cp style=\"margin:0\"\u003e\u003cstrong\u003eDelivery Contents\u003c\/strong\u003e\u003c\/p\u003e\u003cul style=\"margin:0;padding-left:1.5em\"\u003e\u003cli\u003eComplete set — box, papers, warranty card, manuals\u003c\/li\u003e\u003c\/ul\u003e\u003cp style=\"margin:0\"\u003ePlease refer to photos for full contents.\u003c\/p\u003e\u003cp style=\"margin:0\"\u003e\u003cbr\u003e\u003c\/p\u003e\u003cp style=\"margin:0\"\u003e\u003cstrong\u003eService \u0026amp; Authenticity\u003c\/strong\u003e\u003c\/p\u003e\u003cp style=\"margin:0\"\u003e\u003cbr\u003e\u003c\/p\u003e\u003cul style=\"margin:0;padding-left:1.5em\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eTimegrapher:\u003c\/strong\u003e 336 amplitude\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eService History:\u003c\/strong\u003e No known service history\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e Active — card dated March 2025, base coverage through March 2027, extendable to \u003cstrong\u003eMarch 2033\u003c\/strong\u003e via JLC Care program\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp style=\"margin:0\"\u003e\u003cbr\u003e\u003c\/p\u003e\u003cp style=\"margin:0\"\u003e\u003cstrong\u003eShipping \u0026amp; Legal\u003c\/strong\u003e\u003c\/p\u003e\u003cp style=\"margin:0\"\u003e\u003cbr\u003e\u003c\/p\u003e\u003cul style=\"margin:0;padding-left:1.5em\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eBased in:\u003c\/strong\u003e Cullman, AL\u003c\/li\u003e\n\u003cli\u003eWe serve buyers in Nashville, Atlanta, and Memphis — insured shipping or in-person meetup available.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping:\u003c\/strong\u003e Fully insured overnight with tracking provided\u003c\/li\u003e\n\u003cli\u003eShipping within CONUS only\u003c\/li\u003e\n\u003cli\u003eBuyers are responsible for any applicable taxes and duties\u003c\/li\u003e\n\u003cli\u003eWatch is sold in accordance with United States laws and regulations\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp style=\"margin:0\"\u003e\u003cbr\u003e\u003c\/p\u003e\u003cp style=\"margin:0\"\u003eAll watches are inspected by our watchmakers for condition, authenticity, and functionality before sale. Feel free to reach out via messenger with any questions.\u003c\/p\u003e","brand":"Jaeger-LeCoultre","offers":[{"title":"Default Title","offer_id":68057674252367,"sku":"2753X","price":9500.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0636\/1733\/5375\/files\/7d5dc95a71f9f7304b91f03ba84b3dd4.jpg?v=1794422004","url":"https:\/\/kingdomwatchcompany.com\/products\/2025-jaeger-lecoultre-master-ultra-thin-reserve-de-marche","provider":"Kingdom Watch Company","version":"1.0","type":"link"}