Hello, just bought an UPO and was wondering hence I read that it's better to be safe than sorry and check if I really got a gen ETA movement. Is there anyway to check if I have a gen ETA like date font or so, or do I have to open the caseback and look for the ETA stamp on the movement. If this is the case is there any tutorial or so how to open the backcase of the watch? (have not recieved the watch yet but just wondering).