The dial colour looks like paint to me, not patina.
The Z on the dial is slanted, the rest of the word is square & upright.
SWISS MADE has little gap between the words.
Does the hand colour match the index colour?
My Zeniths are a bit younger, but they have reference numbers inside the caseback, & a number on the outside.
The case says waterproof, but is there a gasket?
The movt looks good.
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