Case size and bracelet length
What the numbers in a record mean on the wrist, and how to give us the right bracelet length the first time.
Short answer
Case diameter is the factory’s stated measurement and is listed on every record; the range in the file runs from 26mm ladies’ pieces to 46mm B&R cases, with 36mm, 40mm, 41mm and 42mm covering most of the catalogue. Bracelet length is not the same as wrist size: measure your wrist in millimetres with a tape, add nothing, and tell us the number — we size the bracelet to it and send the spare links with the watch. A steel bracelet can be shortened or extended; a rubber or leather strap is cut to length, so the measurement matters more there.
Checked on 2026-10-22 against the pages and catalogue data on this site.
How do I measure my wrist?
- Wrap a tape measure around the wrist bone, flat against the skin, no slack.
- Read it in millimetres (a 17.5cm wrist is 175mm).
- If you are between two numbers, give the larger one — links can be removed, not added from thin air.
What do the case sizes look like on the wrist?
- 26–31mm — ladies’ Datejust, Pearlmaster, Ballon Bleu small
- 36–38mm — Datejust 36, Day-Date 36, Oyster Perpetual 36: the safe everyday size
- 40–41mm — Submariner, Daytona, GMT-Master II, Royal Oak 41, Nautilus 5711
- 42–46mm — Sea-Dweller, Sky-Dweller, RM and Bell & Ross cases: visibly large
Does a leather or rubber strap change the answer?
Yes. A steel bracelet has removable links, so a small error is correctable. A strap is cut to length, so give the measurement in millimetres and we cut it before shipping.
Where is the case size shown?
On each record, in the specifications block, as the factory states it — 40mm x 12.25mm for a Daytona, for example. Where the factory does not state a size, the line is left empty rather than estimated.
Before you order
Want the QC frames — and the final price?
Send the reference and we reply with the frames of the actual watch and the price on the bracelet.