The Rolex Perpetual 1908 and Breguet Classique 5157 are self-winding precious-metal dress watches, but their published specifications point to different priorities. The cited Rolex 1908 reference 52508 is larger and thicker, with a stated approximately 66-hour power reserve and 50 m water resistance. The 5157 is slimmer, at 5.5 mm thick, and features a hand-guilloché dial; its stated reserve is 45 hours and its water resistance is 3 BAR. Those are manufacturer specifications, not results from a common test.
At a glance: Rolex 1908 vs. Breguet Classique 5157
| Specification | Rolex Perpetual 1908, reference 52508 | Breguet Classique 5157 |
|---|---|---|
| Diameter | 39 mm, per Rolex’s 2025 presentation sheet | 38 mm, per Breguet’s product page |
| Thickness | 9.50 mm, per Rolex’s 2025 presentation sheet | 5.5 mm, per Breguet’s product page |
| Case material | 18 kt yellow gold for reference 52508 | 18K rose gold or 18K white gold in the cited official variants |
| Movement | Automatic mechanical Rolex calibre 7140 | Automatic Breguet calibre 502.3 |
| Stated power reserve | Approximately 66 hours | 45 hours |
| Stated water resistance | 50 m / 165 ft | 3 BAR; Breguet’s instructions identify this as 30 m |
| Dial and display | Central hour and minute hands; small seconds at six | Roman numerals, blued open-tipped hands and a hand-guilloché dial |
| Caseback | Transparent sapphire caseback | Sapphire caseback |
| Current price and availability | Not stated on the cited product page; check an official retailer in your market | Not stated on the cited product page; Breguet directs visitors to a point of sale |
The Rolex dimensions apply specifically to reference 52508 and should not be assumed to describe every 1908 variant. The Breguet specifications are for the Classique 5157; its cited official rose-gold and white-gold references are 5157BR/11/9V6 and 5157BB/11/9V6, respectively. [Rolex 1908 product page] [Rolex 2025 presentation sheet] [Breguet rose-gold 5157] [Breguet white-gold 5157]
Which watch is thinner and smaller?
The Breguet is the slimmer watch on the published figures: 5.5 mm thick versus 9.50 mm for the cited Rolex 52508, a 4 mm difference between these particular configurations. Its diameter is also 1 mm smaller, at 38 mm versus 39 mm. Both list a 20 mm lug width. Dimensions alone do not establish how either watch will sit or feel on a particular wrist.
How do their movements and power reserves compare?
Both watches use automatic mechanical movements. Rolex states that calibre 7140 has an approximately 66-hour power reserve, while Breguet gives calibre 502.3 a 45-hour reserve. The Rolex figure is about 21 hours longer, but these are separate manufacturer claims rather than results from a shared test.
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Rolex calibre 7140
Rolex lists a 4 Hz frequency, 38 jewels, a Syloxi silicon hairspring, a Chronergy escapement and Paraflex shock absorbers for calibre 7140. For reference 52508, Rolex also states a Superlative Chronometer specification of −2/+2 seconds per day after casing. That is Rolex’s stated standard, not an independent comparative accuracy result. [Rolex 1908 product page] [Rolex 2025 presentation sheet]
Breguet calibre 502.3
Breguet lists calibre 502.3 at 3 Hz, with 162 components and a movement thickness of 2.4 mm. Its stated power reserve is 45 hours. The movement is visible through the sapphire caseback. [Breguet Classique 5157 product page]
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What distinguishes their design and finishing?
Rolex 1908
On the cited yellow-gold 52508, Rolex describes a polished 18 kt gold case, domed and fluted bezel, domed transparent caseback, central hour and minute hands, and small seconds at six. The product page shows it on a leather strap. Rolex’s 1908 overview also describes a Settimo bracelet configuration introduced in 2025; bracelet and strap details should not be blended when comparing specific versions. [Rolex 1908 product page] [Rolex 1908 overview]
Breguet Classique 5157
Breguet highlights a hand-guilloché silvery dial, Roman numeral chapter, blued open-tipped hands, fluted case band and sapphire caseback. The brand says the dial is hand-engraved on a rose engine and includes an individual number and a secret signature at specified dial positions. The cited variants are shown with alligator straps. These are distinctive finishing and design details, not evidence that one watch is more legible or better finished in use. [Breguet rose-gold 5157]
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How should you interpret the water-resistance ratings?
Rolex lists 50 m water resistance for reference 52508. Breguet lists 3 BAR for the 5157, and its user instructions identify that rating as 30 m. The numbers are not a guarantee that either watch is suitable for a particular activity; follow the maker’s instructions and service guidance rather than treating a rating as an activity recommendation. [Rolex 1908 product page] [Breguet Classique 5157 product page] [Breguet 5157 user instructions]
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Which one should you choose?
- Consider the Breguet 5157 if your priority is a particularly slim published profile and traditional dial detailing such as hand guilloché and Roman numerals.
- Consider the Rolex 1908 reference 52508 if you prefer the cited 39 mm yellow-gold configuration, its small-seconds layout, Rolex’s stated longer reserve, or its higher published water-resistance rating.
- Compare exact configurations. The Rolex cited here is yellow gold; the official Breguet variants cited here are rose gold and white gold. The broader 1908 line includes other metals, dials, straps and a Settimo bracelet configuration, so match reference, metal and attachment before comparing appearance or cost.
- Try them on if fit matters. The published diameter and thickness figures do not establish comfort, legibility on the wrist or how each case wears.
Neither specification sheet establishes which watch keeps time better in independent use, costs less to service, holds value better or is available at a particular price. Breguet directs buyers to a point of sale for recommended price, while Rolex directs buyers to official retailers; price, stock and secondary-market values depend on market and date. [Breguet Classique 5157 product page] [Rolex 1908 product page]
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