Weigh in: which buckle is most appealing aesthetically paired with a SS Speedmaster?

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Which looks best to you….or something else not pictured.

 
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Top one IMO, the angular look suits the more technical and professional styling of the Speedmaster than the more curved and elegant tang buckle designs.
 
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Depends on the age of the watch.

Buckle 1 late 60’s early 70’s.
Buckle 2 mid 60’s.
Buckle 3 modern.