Zenith bumper calibre 133.8

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The dial reminds me of the 1st Gen Nivada Antarctic from 1958.

Good catch! It does, and is an uncommon variation on the Zenith bumpers.
 
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Stumbled on this thread by chance (as I don't follow Zenith vintages, and I don't want to open another hole where money disappears 😀), but what struck me was the the design of the 3-6-9-12 hour markers that look exactly the same as on the Omega golf ball dials.
 
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what struck me was the the design of the 3-6-9-12 hour markers that look exactly the same as on the Omega golf ball dials.
Maybe they both used the same dial maker.