On most Rolex watches, the reference number sits between the lugs at 6 o’clock....

https://charlie-wiki.win/index.php/Can_I_Get_My_Rolex_Evaluated_for_Free_in_San_Diego%3F

On most Rolex watches, the reference number sits between the lugs at 6 o’clock. In San Diego, use a staffed shop, ask for written terms, and get a dated receipt with clear photos of the watch’s condition before handing it over