What Can You Tell Me About This Omega Buckle?

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It came on a 1952 Seamaster 2635 that I recently purchased, but it doesn’t look like any Omega buckle that I’ve ever seen, but I believe that it’s legitimate.
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I have a few of these from vintage series I dynamic straps. My guess is that they’re from the 1970’s or later.
 
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I have a few of these from vintage series I dynamic straps. My guess is that they’re from the 1970’s or later.

My gut reaction was that it wasn’t a 50’s buckle. 70’s seems much more likely.
 
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My gut reaction was that it wasn’t a 50’s buckle. 70’s seems much more likely.
That's what I think as well. Thanks for confirming.