I have just found a fun dealer's catalog from 1977, which it shows a "Lady Monza" . . . that's right, a version of our beloved Monza, but for the ladies. We know that Alex has dismissed the Silverstones are "ladies watches", but who can guess what this "Lady Monza" might be? Pink PVD? Smaller size? Maybe the black PVD chrono with a matching necklace? [I point out that this catalog was issued by a Heuer dealer, rather than Heuer itself, so no need to go through all your catalogs looking for this special Monza.]
Let's see some guesses, and then I will post a scan of the catalog.
Jeff