I just read your post on this mysterious Milspec1



After (very) close and torough examination against some Torneks , I can tell you that this is a full spec TR900 except the dial inscription and the engraving on the back.
It look like it is a pre production model or a prototype.
Even more interesting is that I had recently another very similar Milspec1 bought by Jeff from a common friend and later sold to switzerland.
This watch had the same mysterious engraving AM 10X but was probably another prototype.
This time of the "US NAVY" Blancpain with the same case as the "US Navy" (but different from the TR900...)
Both models had fixed bars wich is not the case for most of the "civilian" Milspecs. IMHO "AM" stand for "American Military"
So these are surely both missing links at least until further informations surfaces.
Bonne soirée,
Eric