Journal ·
Why the reference number matters more than the model name
Two watches with the same name can need different film. How references map to case shape, and how to find yours.
A model name groups watches that share an idea. A reference number identifies one physical object: one case diameter, one bezel, one bracelet, one set of lug shapes. Protection film follows the object, not the idea.
Same name, different case
A Datejust can be 31, 36 or 41 mm, with a fluted, smooth or gem-set bezel, on an Oyster or Jubilee bracelet. A Royal Oak can be 34, 37, 38, 39 or 41 mm. Each change moves an edge the film has to follow, so each needs its own cut.
Where to find your reference
- On the warranty card or certificate that came with the watch.
- On the caseback, engraved or printed, on many brands.
- Between the lugs at six o'clock on Rolex and Tudor; the bracelet has to come off to see it.
- On the original box label or purchase invoice.
Can't find it? Send clear photos of the dial, caseback and clasp on WhatsApp and we help you identify the reference.
Why it matters for the fit
A film piece that is a little too large lifts at the edge; one that is a little too small leaves a bright line of exposed metal. Cutting to the reference's own shape avoids both, which is why each product page on this site names the exact reference it was cut for.