Omega Calibre 1325 (or 1320) crown stem removal question

How do you remove the crown stem on a 1325/1320???

I have been looking all over the web for what should be a easy question but I cannot find a service manual anywhere. I just picked up a 1973 De Ville 196.0028 with a 1325 movement. Amazingly a new battery brought it to life and it is keeping good time so far. I would like to remove the movement so I can do a really good ultrasonic case cleaning. For the life of me I cannot figure it out. There is no obvious lever.

I do not want to disassemble a 50-year old, working quartz if I do not have to but I am thinking the stem lever must be under the circuit module. Before disassembling, I wanted to check if anyone here knows how to do it.

Thanks in advance. I will add some photos this evening.

I saw that thread. In the end I do not think his suggestion is correct. The commenter didn't claim to know the answer he only gave a suggestion. I have seen pictures of the dial side and the nub he points out is part of the stem mechanism but it is not something that can be depressed.

Thank you so much for this. I was so worried about breaking the movement, I must have not pushed hard enough. I just needed someone to confirm it was the right thing to do.

Here are a few shots of the watch on my 20cm wrist. It's 20mm lugs and case shape make it wear larger then its 34mm diameter would suggest