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The U-Boat U-51 Chimera Bronze reference 6945 is a numbered, 300-piece limited-edition automatic chronograph with a 46 mm naturally aged bronze case. Its layered dial and bold case details make it visually distinctive, but its approximately 18 mm thickness and reported weight of about 185 g are just as important to consider as its movement or finish. This is a watch for buyers who actively want substantial wrist presence and are comfortable with bronze patina—not a discreet everyday chronograph.
What the U-51 Chimera Bronze reference 6945 is
Reference 6945 is a specific U-Boat U-51 Chimera Bronze model, not a generic name for every bronze watch in the Chimera family. The period specification describes it as a numbered limited edition of 300 pieces. A retailer listing has inconsistent edition wording, so the 300-piece figure is the documented period specification rather than a claim that every listing agrees.
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U-Boat Chimera 46mm ss Black Mens Analog Automatic Watch with Leather Bracelet 9605 | $3,250.00 | Buy on Amazon |
The model dates to the early 2010s. Fratello Watches reviewed it in July 2013; Present Watch published a specification page in December 2012. Those sources provide period descriptions, not confirmation of present-day stock or current resale prices.
Reference 6945 specifications
| Specification | Documented detail |
|---|---|
| Case | 46 mm; naturally aged bronze, according to the period specification |
| Movement | Automatic mechanical chronograph; the 2013 Fratello review describes it as ETA/Valjoux 7750-based |
| Jewels and frequency | 25 jewels; 28,800 vibrations per hour (4 Hz), per the period specification |
| Power reserve | 44 hours, per the period specification |
| Functions | Chronograph and date |
| Water resistance | Published rating of 100 m / 10 bar |
| Thickness and weight | Approximately 18 mm thick and approximately 185 g, as reported by Fratello |
| Strap | Hand-finished calf leather, according to the period descriptions; lug width is not established in the cited material |
| Edition | Numbered limited edition of 300 pieces in the period specification |
These figures describe the model as documented in period sources; they do not establish the condition or performance of an individual pre-owned watch. In particular, the published 100 m / 10 bar rating is not proof that an older example remains water-resistant today.
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#1 Best Overall
- Black Leather strap
- Stainless-steel case, Black dial
- Automatic movement
- Case diameter: 46mm
- Water resistant: 100m
Design, size, and wearing character
The 6945 makes its presence through more than diameter alone. Its bronze-toned case and hands frame a layered dial, while the large left-side crown arrangement and external fastening tubes give the case a deliberately technical, industrial look. A smoked display back exposes the movement. Together, those details produce a conspicuous design rather than a conventional, restrained chronograph.
At 46 mm across and roughly 18 mm thick, it is a substantial watch. Fratello also reports an approximate weight of 185 g. Those dimensions and that reported weight make wrist fit and personal comfort central buying questions: case diameter alone understates how much watch there is on the wrist. The available sources establish the dimensions and a reviewer’s impression, but do not provide standardized fit testing across wrist sizes.
Bronze is part of the appeal and the trade-off. The case is described as naturally aged, so buyers should expect its appearance to evolve rather than assume it will retain a uniform, bright finish. The sources do not quantify how quickly a particular example will change; patina depends on the watch’s history and conditions of use.
Movement and practical specifications
The documented movement is an automatic mechanical chronograph with a date, 25 jewels, a 28,800-vph (4 Hz) frequency, and a published 44-hour power reserve. Fratello identifies it as ETA/Valjoux 7750-based. That is a period review’s movement description, not a current manufacturer specification or an independent test of accuracy, reserve, or chronograph operation on any particular watch.
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What the 2013 review says about finish
Robert-Jan Broer’s 2013 Fratello review is positive about the watch’s design and finish while acknowledging its considerable size, weight, and price level. His hands-on assessment is a reviewer’s opinion, not laboratory testing. He wrote that “there is only little to criticize in terms of quality and finish of this watch.” That is useful context for evaluating its presentation, but it cannot establish the condition or quality of a different example offered for sale today.
Historical prices are not current market value
The period sources give different historical retail figures: Fratello reported an official list price of €6,900 in July 2013, while Present Watch listed €7,650 in December 2012. These are dated figures from different sources, not a current price range or evidence of a present-day transaction value.
A retailer page was marked unavailable when accessed, and the available material does not establish current exact-reference availability or a defensible present-day price. Treat any live asking price as a seller’s offer, not proof of market value; comparable condition, completeness, service history, and authenticity all matter.
How to assess a pre-owned reference 6945
Before committing to a specific watch, establish that it is actually reference 6945 and assess the individual example rather than relying on the model’s original specification.
- Confirm the reference and identity. Ask for clear photographs of the watch and any available serial or documentation details. Check that the seller identifies it as U-51 Chimera Bronze reference 6945, rather than using a broad Chimera or bronze description.
- Inspect the case and patina. Look closely at the bronze case, external fastening tubes, crown arrangement, and signs of wear or damage. A naturally aged appearance is part of the described model, but condition should be judged on the actual watch.
- Check the dial, hands, and display back. Compare the layered dial, bronze-toned hands, and smoked display back with clear reference-specific images. Ask about replaced or altered parts if originality matters to you.
- Request service and function information. Ask when the movement was last serviced and whether the chronograph, date, and winding have been checked. The published 44-hour reserve is a model specification, not a guarantee for an unserviced or worn example.
- Verify water resistance independently if needed. Request a recent pressure-test result from a qualified watchmaker rather than relying on the original 100 m / 10 bar rating.
- Confirm strap fit before buying replacements. The period description identifies a hand-finished calf-leather strap, but the cited material does not establish the reference 6945 lug width. Do not assume strap measurements listed for another Chimera reference will fit.
- Evaluate price against the specific example. Compare condition, service documentation, included items, and seller terms. The 2012 and 2013 retail figures are historical context only, not a basis for valuing a current listing.
Do not confuse reference 6945 with current Chimera models
U-Boat’s current Chimera Damasco Bronze page is for reference 3006, a distinct model. Its specifications—including an ETA 2824 movement and 22/22 mm strap information—do not apply to reference 6945. Use exact-reference documentation when checking parts, strap compatibility, or specifications; a shared Chimera family name is not enough to establish that details carry over.
Quick Recap
Who should consider the 6945?
- A plausible fit: someone who wants a large, visually assertive bronze chronograph, values its layered and industrial design, and is comfortable with a case whose appearance can change over time.
- A less suitable choice: someone seeking a slim, light, low-profile watch, a discreet design, or a watch whose current value and availability can be established from the period sources alone.
- For any buyer: the appeal of the model does not remove the need to verify the individual watch’s identity, condition, service history, and water resistance.
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.
