I am looking for a hair spring replacement for a Zodiac SST3600.  The movement diagram shows the part number to be 734.  Is there a suitable replacement since this is a high beat movement?

Thanks for contibuting Dawid!

Hi. Unfortunately, it is very difficult to estimate the exact dates of introduction of these models because much of the archival material was lost with the bankruptcy of the company in 1979. The only things we have are surviving catalogs, press materials and advertisements. Based on what I've been able to find, the 905 model was available as early as 1949, as evidenced by an advertisement in the Zodiac Archive book. It is also presented in the catalog of 1952 (cal.12) and 1955 (catalog name Edward 1736) already together with the automatic model (catalog name Leonard 1732). In the next material from 1961 only the automatic model is presented, which allows us to conclude that ref.905 has ceased to be produced. I have in my possession a full set of ref.905 with a proof of purchase from 1959, which allows me to make the claim that the model was certainly produced in
1949-59.
Ref.908 of the first generation appears in the 1955 catalog and is offered to customers in an unchanged version also in 1961, which gives evidence that the second generation could not have been produced in 1961- 1962.
The Grant (catalog name 1737) because that is the name of the second-generation Ref.743-908 model did not show up until 1964 and in my opinion it was produced until 1975, as it no longer appears in later catalogues. . These are my personal observations and I would be happy to learn more about TDMP if anyone has any additional information. Dawid.

Cheers !!!

I have this same understanding.

It is my understanding that the Triple Date Moonphase Watch had two generations:

First generation :
- movement hand wind ref. 905 cal.12S or cal.1100
- movement automatic ref. 908 cal.1402

Second generation :
- movement automatic ref. 742-908 cal.74 silver case
- movement automatic ref. 743-908 cal.74 gold plated case

Does anyone know exactly when the 1st generation was introduced, and how long after that until the 2nd gen was introduced?

I have seen the catalogue from 1955 that shows a 1st gen 905 and 908; however, the catalogue from 1953 did not have them.

Following...

Hello, I am looking for a black dial with silver indexes for a triple date moonphase ref.908 automatic from the 1950's. Exactly as shown in the picture. Please let me know if any of you have one for sale or know where to buy one. Thank you and best regards. Dawid.

Thank you gentlemen. I wish all users good luck in expanding their zodiac collections and much health in the coming New Year.

Per the 1990's catalogs that is the smaller auto version. Some may say womens or boys, or just for a smaller wrist.

I recently acquired this Zodiac from the 90s. I believe it's from the era where there was some Tag crossover in design. The ref number on the back doesn't really net much online (beyond the auction I bought it from). I can find this design in a quartz version without the 'automatic' designation. I can also find a white dial auto version.

Any further info would be appreciated. I'm curious if it's technically designed to be a women's watch since it's pretty slender.

Either way, thanks for your help!