Excellent, nice to have a version in English too.

I've also come across the same type of ad before - but never dated. The ad may have appeared earlier, but other sources mention 1954 as the introduction year of the logo as well without verifying it this specifically. I think we may assume even if only carefully that 1954 is the year.

I remembered this. It took some digging buty I finally found it.

Much of Zodiacs history is shrouded in mystery. There is no archive and no official account. Online you find fragmented pieces of information but often they are contradictory or flawed. Even the best of sources like this site get some things wrong, my own previous articles included.

I thought I knew a lot of details, because I heard my late father, Zodiacs agent to Denmark, mention them - but I was rightly confronted by collectors: "How do you know this?" "I heard when I was 12 years old" is probably not the most accurate historical source.

Thats why I started digging. And when you dig, you find.

I just found this: A sort of birth certificate for the Zodiac logo, the crosshairs circle: Appearing in 1954 in a magazine called La Suisse Horlogere, aimed at watch industry professionals, this printed advertisement explains that the logo was recently introduced to counter imitations by competitors.

Use of the logo is specifically linked to the Glorious model line also recently introduced according to the text and the succesful Autographic series - a particular succes in the US, Zodiac informs us.

Enjoy your #ZodiacSunday.

Both are models worthy of being in someone's collection but those prices are nonsense.  Greedy sellers really maxed out selling prices shortly after the 'vid era, and as usually happens they crashed the market out to an extent.  Many online sellers are still trying to get those prices and beyond but its just not happening.  Luckily it doesn't seem like they completely cratered the hobby but those ridiculous offerings for double, triple or quadruple the actual value just seem comical now.

256933043882
     

But does it sell? The vintage market appears to me not to be doing well right now. Hardly anything moves.

146768848275

Through further research it looks like the ET33.1W is the crystal.  Will give final update when finished.

Need crystal for Zodiac 591 883 case. Can anybody provide part number?  Thank you.

Oh ok.  It does not look like your watch is a quickset, so your stem should be this one:

eBay item number:164441366688

That is in Italy