The crown doesn't function on the Aquaracer Asia 7750 I received from Timeshop.net. I just emailed Mark for RMA. I'll followup with my experience. I followed the Q11 section of Mark's owners manual here: http://www.timeshops.net/page.asp?id=12 but still no success. Crown doesn't do anything. If I pull it out it just pops off. I can pop it back on but still can't set day/date. Is this a common problem with replica chronos? Maybe a 7750 is too many complications for a rep?