advice needed vintage rolex open caseback

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can anyone please confirm if this watch is a push fit or screwback

I have tried both to know avail

many thanks
 
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Snap back. You need to find the correct blade size to start opening the caseback.
if you're not sure, get a watchmaker to do it properly.
 
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Lovely piece btw. I think I'd find someone to do a lume restoration.