Hi boyz'n'girlz

Just found this watch on a flee market. I like Zenith very much but I haven't got a lot of archives. Can anybody help me date this watch that is in a super condition? It'as based on a Minerva movement that begin with 29. if someone had some archives (ads, Zenith extracts, etc)
Some pics :

 

Presumably late 20s or early 30s

 

thanks, any other opinions?

 

https://sites.google.com/site/zenithistoric/les-premiers-chronographes-de-zenith

 

Great page, thanks a bunch.

 

The movement has the reference 19 CH-1 and the movement number dates it to ca. 1929.
You can find the movement and a watch in the Zenith book from Manfred Rössler on page 83.
Good hunting for that beauty !

 

thanks. you are very helpful.

 

Don’t forget to date the hallmarks as well. If it’s silver then there should be both purity and assay year marks on it.