Hi,
Why do you buy this watch when you are in doubt?
I am sorry to say it is a "Frankenwatch", a marriage.
It is a correct chronometer movement for the rare Geneve chronometer in a non correct case!
The case is from the ordinary (non chronometer) Geneve line and should house a Cal. 601
I had it on my watch list as I was curios who would jump on it...
Sorry for the bad news!
kind regards
Erich