Rolex · 1908
Rolex 1908 52508: specifications and what to check
The Rolex that is not an Oyster: a domed transparent case back, a leather strap, 50 metres, and a Syloxi silicon hairspring instead of Parachrom. Almost every habit from the sports references has to be set aside.
Reference 52508 · specifications read from the manufacturer on 2026-09-22 · listed as current
Specifications
As published by Rolex. A field the manufacturer does not state is left out rather than filled in.
- Case
- 39 mm, 18 ct yellow gold, polished finish
- Diameter
- 39 mm
- Water resistance
- Waterproof to 50 metres / 165 feet
- Crystal
- Scratch-resistant sapphire
- Bezel
- Domed and fluted
- Dial
- Intense white
- Case back
- Domed transparent case back with anti-reflective coating
- Crown
- Domed
- Bracelet
- Leather strap, matt brown alligator leather
- Clasp
- Double folding Dualclasp
Movement
- Calibre
- Calibre 7140, manufacture Rolex
- Type
- Perpetual, mechanical, self-winding; bidirectional self-winding via Perpetual rotor
- Power reserve
- Approximately 66 hours
- Certification
- Superlative Chronometer (official chronometer certification + Rolex certification after casing)
- Notes
- Precision −2/+2 sec/day after casing. Centre hour and minute hands with small seconds at 6 o'clock. Syloxi hairspring in silicon with patented geometry, and Paraflex shock absorbers.
What to check before you buy
- Inspect the transparent case back for scratches and for the condition of its anti-reflective coating. It is a display window on the wrist side, it is the first Rolex case back here you can actually see through, and a marked one is immediately noticeable.
- Check the crown is the domed, non-screw-down type this reference specifies. Trying to screw down a crown that was never designed to screw down is a way to damage the stem and the case tube.
- Treat the 50 metre rating as the real constraint it is. This is the least water-resistant watch in this corpus by some margin and should be kept away from water entirely.
- Examine the polished gold case closely for the fine scratching that polished surfaces accumulate. Unlike the satin cases elsewhere, there is nowhere for marks to hide.
- Assess the alligator strap and Dualclasp separately from the watch. Straps are consumable, the clasp is gold, and buyers frequently expect a fresh strap on a gold dress watch.
Set aside what you know about Rolex cases
Nearly every reference in this corpus is built on the Oyster architecture: a monobloc middle case, a screw-down back, a screw-down crown, and a rating of at least 100 metres.
The 1908 is not described that way. It has a domed transparent case back with anti-reflective coating, a domed winding crown rather than a screw-down one, and a water resistance of 50 metres. It comes on a matt brown alligator strap with a gold Dualclasp.
If you handle mostly sports Rolex, every habit you have is slightly wrong here, and the mistakes are avoidable rather than subtle.
A crown that does not screw down
Worth saying directly because it causes real damage. The winding crown on this reference is domed, not a screw-down Twinlock or Triplock.
Someone used to Oyster cases will instinctively push and turn to seat it. There is nothing to seat. Repeated attempts damage the stem and the case tube, and that is a genuine risk on a watch that will often pass through hands more familiar with a Submariner.
Show a buyer how it works, and check on inspection that the previous owner did not learn this the hard way.
Syloxi, not Parachrom
Most Rolex movements documented here use a paramagnetic blue Parachrom hairspring. The calibre 7140 here uses a Syloxi hairspring in silicon with patented geometry instead.
That is a real technical difference rather than a naming one, and it is worth being precise about when describing the watch. It also carries 66 hours rather than the 70 or 72 found elsewhere in the range, and drives small seconds at 6 o'clock rather than a centre seconds hand.
None of those details is hard to check. All of them are easy to get wrong in a listing written from general Rolex knowledge.
A window you can see through
The transparent back is the only one in this collection of pages, and it is an inspection point rather than a feature.
It faces the wrist. It is sapphire with a coating. It collects marks from belt buckles, desk edges and careless removal, and because it is transparent every one of those marks is visible in a way they never are on a solid steel back. Look at it off the wrist under a light before agreeing a price.
Fifty metres means dry
The lowest rating on any watch here — lower even than the Moonwatch's 50 metres in character, because this one also has a non-screw-down crown and a leather strap. Treat it as a watch that should never get wet, and tell the buyer the same.
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Sources
Not affiliated with Rolex. Specifications are read from the manufacturer's own published documentation on the date shown and may change; the manufacturer's current documentation governs.