Modele + Depose help

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Hey all, had this for about 20 years not sure on year etc. What is the best way to take the back off to look at serial numbers and look it up on the omega site ? Best to take to a Watchmaker or is there a diy way to safely unscrew the back? Am i right with thinking its a pre ww2 (mid to late 30's watch)?

Appreciate the help
 
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yes, take it to a watchmaker and let him open it.

seems to be a rather small watch with a cal. 26.5 in it