Help please!

Opened up the Gruen precision watch and it’s a 510RssCA stamp on the inside of the case back, but the movement is covered. I have no idea how to remove it.

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Could it be a press fit cap? I would use a soft implement to lift up at any seam, and if that isn’t available my next step would be to attempt to unscrew.

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Think that is an anti magnetic feature, not sure that is what they look like on some Vostoks I service, it just falls out but on Russian made watches a lot of components just fall out.

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I'd assume it's snaps off with a case knife but as @GotTheTime alludes, eyeballing to find a little groove for lifting (they can be hard to see) at the edge would confirm this. But I'd also just turn this all upside down and give a few light taps to see if it comes loose.

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@GotTheTime @MatthewT @PoorMansRolex was able to use tweezers to pull up case by the crown. Thanks guys!!!

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Not to sure brother good luck 🍀