Having never seen a YG version of an A 3817 before, it's hard to say what's happened - Is this an elaborate franken or unique model?
Things against it:
The crown and possibly pushers are not original.
The hand in the seconds register is incorrect and the other subdial hands look to be replacements (they're thicker than the original set).
The hour markers have been badly relumed.
The case has been (over) polished.
Never seen before in any reference book or period-correct catalog.
Things for it:
Both the main hands and markers are gold (something Zenith did with their gold watches at the time).
The hour markers appear to be correctly sized (the other gold models had A386 length markers, so unless someone plated them, they are original).
The movement has "3019 PHC Zenith thirty-one 31 jewels" with "B Swiss Made" under balance, which was used with the early EPs.
The hallmarks on the gold case seem correct.
Almost all of the things against it can be explained away as cosmetic or service-related. Also, we've seen a few one-off gold models made by Zenith for select customers around this time, so this squarely falls into the realm of possibility.
Click to expand...