I picked up this Cal12 Montreal on eBay last week.
Not working and in need of a tiny bit of TLC.
Anyway, turns out it needs nothing more than some case clamps to secure the movement, correct sweep hand, fix the chrono reset and a case tidy up.
As you can see the case was a bit beat up.
Here's the work so far...
Tidies up pretty well though with a few hours work :-)