Have just recently been offered this vintage Seamaster, I know the crown is replaced but have questions regarding the caseback. Also any knowledge on this reference would be appreciated can’t seem to find much information. Sorry for the poor picture quality, seller didn’t have anything better.
Do you have a more clear view of the inside of the case back? I believe this should be “2577”, not “2677”. I would want better photos as the dial looks completely different in those two photos. Movement is in tough shape.