How to open a case like this?

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Hi guys, I am asking for your help to guide me on how to open a case like this. I have a watch withr that exact same case, and I am thinking of getting a overhaul done for it.



My usual watchmaker and I both couldn't figure out how to open it. I am did find a couple of images showing how it looks like after being opened.



Many thanks in advance for your help!
 
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YASSSSS guys I figured it out! Just push on one end of the hole!
 
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This is in lovely shape. What year and where did you get it. It looks like late 1970's to me.
 
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This is in lovely shape. What year and where did you get it. It looks like late 1970's to me.

I have a watch withr that exact same case,

I am did find a couple of images showing how it looks like after being opened.