For a San Diego Rolex owner, check the reference number between the lugs at 12...

https://rileyssmartjournal.cloudhinter.com/posts/is-submariner-enough-info-when-i-m-trying-to-sell

For a San Diego Rolex owner, check the reference number between the lugs at 12 o’clock before comparing offers. Have a trusted watchmaker remove the bracelet, and don’t post clear photos of the serial number or meet a buyer with the watch alone.