I picked up this movement from Argentina the other day; non-runner (only $35, which seemed fair); the balance staff pivot is broken. An easy enough fix, assuming there isn't anything else wrong with it. However, I was looking up balance wheels and staffs on Jules Borel, and they list a number of different staffs; I'm not sure what I need here. Anyone know how I should figure this out?
Also, the database says that this was made for a period of about 40 years; any idea how to narrow the age? I noticed a "brevet" mark on the dial side, which I assume puts it closer to old end (and the dial style suggests late 40's to me).