Hi All, I ran across this listing from Chrono 24, and really like everything about it. Its tropical dial is amazing and patina is at a decent level (to me). The only thing that make me hesitate, is its crown. I read from this forum that it is called Naiad crown, and unpopular choice for Omega at that period as it didn't do a good job keeping water away. Please correct me if I am wrong. So my question is: Is the crown for this watch correct according to the reference (c2577) and time period (1950s) ?