If you’re checking a Rolex before selling or borrowing against it, don’t remove...
https://wiki-club.win/index.php/What%E2%80%99s_the_Risk_of_Meeting_a_Rolex_Buyer_From_an_Online_Marketplace%3F
If you’re checking a Rolex before selling or borrowing against it, don’t remove the bracelet just to find the reference number. On many models, it’s engraved between the lugs at 12 o’clock, and a watchmaker can check it safely