Aquired a Zenith Horodate

I bought a Horodate, i don’t know much about them except it’s the first Zenith Model to have a date function and that they were made with a 106 cal. In Besançon.
Previous owner bought it in 2007 in Lyon, France.
Anybody be able to tell me about this model (possible date?), or how many were made? I’ve seen guesses from a 200-500

Edit: Based off an earlier thread (link below) is the conclusion that these were made as a prototype project or would this be wrong conclusion?

Caseback number…

Aquired a Zenith Horodate

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Slow Chronomaster Sport Fix?

Wear it most of the time. Bought it new and is under warranty. About 18 months old. Regularly set it to the atomic clock. Consistently ran 4 seconds a day slow up until now. Recently after resetting it to the atomic clock it was 6 seconds slow after a few days. After a week it’s 8 seconds/day slow.

Should I try demagnetizing it? If yes, which demagnetizer to buy, or is it best to take it to a reputable watch repair? Watch seller is not local.

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