If you’re checking a Rolex before selling or borrowing against it, don’t remove...
https://telegra.ph/Selling-a-Rolex-in-San-Diego-What-Homework-Should-I-Do-First-10-15
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