Differences between ZENITH Extract and Register

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How can you expect them to give you information if they don’t have any numbers.

i don’t know why with the A3635 they said No Data, and with De Luca they provided the info.

Perhaps they checked in the pictures the look of the parts, and checked it with archives regarding Mark I, non an specific piece. Because of that, production is between dec 1988 and April 1990

for me, it has some value, even considering that point.
 
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I think he’s saying he provided the serial off the back case but didn’t want to open it to show the movement since most zenith movements don’t have a visible serial number anyways. When I got mine they told me my A384 was produced during a 4 month window in 1970 but didn’t have info on where it was delivered or anything other details. I paid 60chf for the .pdf version since I can print it myself and save 20.

I sent pictures from outside, movement and the both sides of the back cover. The problem is that the movement of the De Luca didn’t show any serial number