Speedmaster #16 end links, pics and opinions requested

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There was a guy who was making 516 endlinks (without stamps) and listing them on ebay, but does not anymore. 516 looks similar to 16 does it not? The endlinks below which are on one of my ex watches below are these aftermarket 516's that I got from him. On another note, I had consigned this watch to a dealer an he sold this watch with 32% profit instantly (sigh!)
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@Baz9614 , any idea what year that watch is? '64ish?
My seamaster case back states 165024-64 S.C. and extract states it was delivered in Aug 1966.
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