Why are you playing with it? Leave it as is until you find a watchmaker to fix it if thats what you want.
The crystal is a pressure fit type and you need a press to install it. Removing it without a replacement leaves the dial exposed which could get damaged and end up costing you more money to fix.
Crown is also not original, so add a new crown and winding stem into the cost.
Press down on screw, push the crown and stem back in, put the back on and leave it alone or you'll be selling it as a parts watch after you break something that's discontinued.
DON
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