The Jaeger-LeCoultre Master Ultra Thin 1907 (reference 129 25 20, also written Q1292520) is a 39 mm pink-gold manual-winding dress watch with a 4.05 mm-thick case and the brand’s calibre 849. It pairs a restrained white grained dial with a slim profile; the main practical caveat in one published review was that the lug tips could catch a tight shirt cuff. The price cited below is historical, not a current quote.
What is the Master Ultra Thin 1907?
This is the pink-gold wristwatch identified by Jaeger-LeCoultre as Master Ultra Thin 1907, reference 129 25 20. The manufacturer’s 2016–2017 Spanish catalogue lists an 18-carat pink-gold case and a manually wound mechanical movement. The “1907” name connects the watch to the brand’s ultra-thin history, but it does not mean this wristwatch uses the historical calibre 145.
Jaeger-LeCoultre’s historical account says Edmond Jaeger challenged Swiss watchmakers in 1903 to create an ultra-thin calibre, leading to LeCoultre calibre 145 in 1907. That is heritage context, not the movement inside this watch; the 1907 wristwatch uses calibre 849. Jaeger-LeCoultre’s Master Ultra Thin Date page discusses that history in connection with a different model.
Specifications
| Specification | Master Ultra Thin 1907 |
|---|---|
| Reference | 129 25 20 / Q1292520, as identified in Jaeger-LeCoultre’s 2016–2017 Spanish catalogue and Monochrome’s 2014 review |
| Case material | 18-carat pink gold, according to Jaeger-LeCoultre’s 2016–2017 Spanish catalogue |
| Case diameter | 39 mm, according to the catalogue and Monochrome’s 2014 review |
| Case thickness | 4.05 mm, as reported by Monochrome in 2014 |
| Movement | Jaeger-LeCoultre calibre 849, manually wound mechanical |
| Movement height | 1.85 mm, as reported by Monochrome in 2014 |
| Movement parts | 123, listed by Jaeger-LeCoultre’s catalogue and Monochrome’s review |
| Frequency | 21,600 beats per hour, according to Jaeger-LeCoultre’s 2016–2017 Spanish catalogue |
| Power reserve | 35 hours, according to the catalogue and Monochrome’s review |
| Functions | Hours and minutes, according to Jaeger-LeCoultre’s catalogue |
| Water resistance | 3 bar, according to Jaeger-LeCoultre’s 2016–2017 Spanish catalogue |
| Crystal and caseback | Sapphire crystal and solid caseback, as described by Monochrome in 2014 |
| Strap | Alligator leather; Monochrome describes a brown alligator strap with a pink-gold tang buckle |
| Current price and availability | Not established by the cited sources; no current quote or stock status is confirmed |
Figures come from Monochrome Watches’ review, published 15 September 2014, and Jaeger-LeCoultre’s 2016–2017 Spanish catalogue. The catalogue’s language and edition period matter: it is a manufacturer source for the listed specifications, not evidence of present-day availability.
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- Strap Material: Crafted from premium full-grain leather, the surface features a specially treated worn effect for a vintage look. The inner side in contact with the wrist is lined with comfortable artificial suede. Paired with classic color-block stitching and a sturdy stainless steel buckle, these straps strike the perfect balance between durability and style. Suitable for various occasions, they are ideal for both casual and formal wear.
- Size Selection: Before purchasing, please confirm the strap size compatible with your watch. The distance between the lugs where the strap connects to the watch case determines the strap width. The strap will only fit your watch if its width matches the lug width of your watch.
- Strap Adjustment: Featuring multiple adjustment holes for a worry-free fit. With more than 12 adjustment holes, it ensures precise fitting for various wrist sizes.
- Package Contents: Your order will include 1 genuine leather strap, one pair of spring bars, and a spring bar tool.
- Worry-Free After-Sales Service: We offer a "90-Day No-Hassle Replacement" service. Is the strap fading? Does it not meet your expectations in terms of texture? As long as there is no human-induced damage, we will replace it for you directly! For custom requests, please feel free to contact our customer service. Thank you for your purchase!
Case, dial and wearing experience
A genuinely slim profile
At 4.05 mm thick, the case is the watch’s defining physical feature. Monochrome describes a knife-shaped case and notes that the movement itself measures 1.85 mm high. Those dimensions help explain the low-profile design without making a broader claim that this is the world’s thinnest watch. The 2016–2017 catalogue presents it as one of the world’s thinnest manual-winding mechanical watches; that claim is bounded to its category and the catalogue’s period.
A restrained dress-watch dial
Monochrome describes a white, finely grained dial with printed minute dots and hour markers, paired with dauphine hands. Its review emphasizes the warm contrast of pink gold against the textured pale dial. The display is limited to hours and minutes, consistent with the manufacturer’s catalogue.
Rank #2
- Strap Material: Crafted from premium full-grain leather, the surface features a specially treated worn effect for a vintage look. The inner side in contact with the wrist is lined with comfortable artificial suede. Paired with classic color-block stitching and a sturdy stainless steel buckle, these straps strike the perfect balance between durability and style. Suitable for various occasions, they are ideal for both casual and formal wear.
- Size Selection: Before purchasing, please confirm the strap size compatible with your watch. The distance between the lugs where the strap connects to the watch case determines the strap width. The strap will only fit your watch if its width matches the lug width of your watch.
- Strap Adjustment: Featuring multiple adjustment holes for a worry-free fit. With more than 12 adjustment holes, it ensures precise fitting for various wrist sizes.
- Package Contents: Your order will include 1 genuine leather strap, one pair of spring bars, and a spring bar tool.
- Worry-Free After-Sales Service: We offer a "90-Day No-Hassle Replacement" service. Is the strap fading? Does it not meet your expectations in terms of texture? As long as there is no human-induced damage, we will replace it for you directly! For custom requests, please feel free to contact our customer service. Thank you for your purchase!
Comfort and cuff clearance
Frank Geelen’s 2014 Monochrome review describes the watch as light and comfortable on the wrist. His qualification is specific: the lugs do not curve downward, and their tips can feel sharp against a tight shirt cuff. That is one reviewer’s wearing impression, not a repeated or independently measured test; buyers who wear close-fitting cuffs should consider the lug shape as well as the exceptionally slim case.
Movement and practical limits
Calibre 849 is a manually wound movement with 123 parts and a 35-hour power reserve. The catalogue gives its frequency as 21,600 beats per hour. Its thin construction suits the watch’s profile, but the stated reserve is a little over a day, so an owner who takes the watch off may need to wind and reset it after it has stopped.
Rank #3
- Selected calf leather, leather shoes feel soft and comfortable, and the body of the watch as one!
- The bottom leather is comfortable, soft, breathable, waterproof and sweatproof, which can effectively resist the erosion of sweat and prevent odour.
- The clasp is made of 316 stainless steel, polished meticulously and stable without fading.
- Please measure the lug width before ordering, the lug width must be exactly the same as the selected strap width to ensure accurate wearing.
- A set of matching spring bars and installation tools are included.
The catalogue rates water resistance at 3 bar. That specification should not be read as a promise that the watch is suited to swimming or regular water exposure; it is best treated as a dress watch, not a sports watch. The cited sources do not provide a more detailed usage rating.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Price and availability
Monochrome’s 15 September 2014 review reported a retail price of just over €15,000, including tax. This is a dated historical figure, not a current price or an indication of what a particular used example should cost. Neither that review nor Jaeger-LeCoultre’s 2016–2017 catalogue establishes current stock, a present-day list price or a verified marketplace offer. For a current quote, confirm the exact reference, condition, provenance and seller directly.
Quick Recap
Best Value
- Strap Material: Crafted from premium full-grain leather, the surface features a specially treated worn effect for a vintage look. The inner side in contact with the wrist is lined with comfortable artificial suede. Paired with classic color-block stitching and a sturdy stainless steel buckle, these straps strike the perfect balance between durability and style. Suitable for various occasions, they are ideal for both casual and formal wear.
- Size Selection: Before purchasing, please confirm the strap size compatible with your watch. The distance between the lugs where the strap connects to the watch case determines the strap width. The strap will only fit your watch if its width matches the lug width of your watch.
- Strap Adjustment: Featuring multiple adjustment holes for a worry-free fit. With more than 12 adjustment holes, it ensures precise fitting for various wrist sizes.
- Package Contents: Your order will include 1 genuine leather strap, one pair of spring bars, and a spring bar tool.
- Worry-Free After-Sales Service: We offer a "90-Day No-Hassle Replacement" service. Is the strap fading? Does it not meet your expectations in terms of texture? As long as there is no human-induced damage, we will replace it for you directly! For custom requests, please feel free to contact our customer service. Thank you for your purchase!
Rank #4
- Strap Material: Crafted from premium full-grain leather, the surface features a specially treated worn effect for a vintage look. The inner side in contact with the wrist is lined with comfortable artificial suede. Paired with classic color-block stitching and a sturdy stainless steel buckle, these straps strike the perfect balance between durability and style. Suitable for various occasions, they are ideal for both casual and formal wear.
- Size Selection: Before purchasing, please confirm the strap size compatible with your watch. The distance between the lugs where the strap connects to the watch case determines the strap width. The strap will only fit your watch if its width matches the lug width of your watch.
- Strap Adjustment: Featuring multiple adjustment holes for a worry-free fit. With more than 12 adjustment holes, it ensures precise fitting for various wrist sizes.
- Package Contents: Your order will include 1 genuine leather strap, one pair of spring bars, and a spring bar tool.
- Worry-Free After-Sales Service: We offer a "90-Day No-Hassle Replacement" service. Is the strap fading? Does it not meet your expectations in terms of texture? As long as there is no human-induced damage, we will replace it for you directly! For custom requests, please feel free to contact our customer service. Thank you for your purchase!
Who is it for?
- A good fit: someone looking for a discreet, manually wound pink-gold dress watch whose extremely slim case can sit close to the wrist.
- Think carefully if: you wear tight shirt cuffs, want more than hours and minutes, or prefer a longer reserve between windings.
- Not the right assumption: “ultra-thin” does not make it a water-oriented everyday sports watch, and the model name does not mean it contains calibre 145.
Sources
- Monochrome Watches, “Jaeger-LeCoultre Master Ultra Thin 1907 Review,” 15 September 2014 — dimensions, movement details, design description, wearing impressions and historical price.
- Jaeger-LeCoultre 2016–2017 Spanish catalogue — reference and manufacturer-listed specifications.
- Jaeger-LeCoultre Master Ultra Thin Date page — historical context on calibre 145; it concerns a different model.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
