Vintage Omega

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Hi everyone I just wanted help identifying the reference for this watch. I only have one of the two straps and want to replace and it possibly get it serviced.
 
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Please show a photo of the inside of the caseback, and the movement while you're at it.
 
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I will see if I can get it open most likely not though due to me not having the tool to open it with.
 
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It's an American market watch, probably caliber 550, early-mid 1960s.