Yep, and there are Cal 12 Monzas with Monza on the dial too, as Arno linked to below.

They are catalogued too, briefly in 1978:

http://www.chronocentric.com/forums/heuer/index.cgi?page=1;md=read;id=31143

Not sure on the linked one though Julien. The "Monza" script looks a bit exaggerated, particularly the serifs, and the watches with the Monza name usually have a silver date window surround, as in the catalogue above and the one of Jasper's that Arno linked - it's the non-marked "economy" versions that I would expect to have no window at all like this. It says that the case is steel too, and it looks like it may well be - whereas the Monza should have a base metal (i.e. brass), either PVD coated or chromed. Ask for photos of the caseback, which should be marked with the Monza reference number to make sure this isn't in fact a Carrera case. Stiff money too, especially given there are some question marks.