The OP's dial is good. The later, reference-less cal 156s (such as the OP posts) are a different watch from the earlier ref 19518, such as bigsom posts. The later watches are a thinner case, with thinner lugs, gold second sweep hand, printed instead of embossed 'Zenith' and slightly different printing - a less lush watch, although not without its appeal.
Ref 19518
View attachment 421871
later 156
View attachment 421870
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