How to open the case back of an old thin Omega from 1940-1960s

@JimInOz

No worries

I’m just happy I got very fast responses from multiple members suggesting various solution. Always on your own risk when you ask around on forums, I followed a few hints combined with some common sense (having the watch in front of me in real life is an advantage of course) and finally solved the problem.

Again for completion, it was “only” 14k gold.

A quick bonus question. The crown is in yellow material (perhaps gold) but with no mark. Is this indication of a replacement crown or did some dress watches come without an Omega mark (Ref BD 131.0016)?

I know my Omega Suverän (CK 2400, 30T2 PC) from 1947 has a steel crown without an Omega mark and this is how it is supposed to be.

Sorry to thread jack and bring this old post but I have something similar. I picked this up a while ago and would like to see the movement inside. It has the almost the same configuration that it can only be open front the glass, but I have no idea after what to do. Any insight would be greatly appreciated.

Similar, this has a split stem which the crown pulls off the the stem gently pull the crown out all the way and then pull some more and it'll come apart ( hold onto the movement and don't throw it across the room like I have done lol ) after the crown is off that brass part will rotate slide it up like the picture and the movement rotates I quarter turn I believe and it'll just fall out

hi,

do i pull the stem after i rotate the brass part counter clockwise? i tried pulling the crown after rotating the brass as indicated in the photo but the crown didnt move at all.