I had a terrible experience with CrownandCaliber. They were suppose to "service" my watches and list it for 60days. None of my watches sold at their suggested price after 3 months, and my Rolex was "serviced" extremely poorly. It came back with a shoddy polishing job, and it stopped working after a few months. I sent it to Rolex Canada in Toronto, and Rolex said the movement had never been serviced recently and the lubricant had dried out.
I asked CrownandCaliber about their "service", and their one-year guarantee if a customer had purchased it. They admitted they had open the caseback to authenticate but did not "service" the movement. After a few emails back and forth, they agree to compensate me with a $200 voucher for this "miscommunication".
TLDR: don't sell or buy from CrownandCaliber