Before selling or borrowing against your Rolex, check the reference number...

https://victor-wiki.win/index.php/What%E2%80%99s_the_Risk_of_Meeting_a_Rolex_Buyer_From_an_Online_Marketplace%3F

Before selling or borrowing against your Rolex, check the reference number engraved inside the rehaut on many newer models. Don’t share photos showing the serial number publicly