Uh, yeah, really. There's Castellos out there with no shape number (I have one), I have a Savinelli that says Ita and I thought maybe this was the maker's name but now I think that maybe, just maybe, it's short for Italy, but it wasn't stamped right. My Radice Underwood is stamped "Bark".... this being their other rustication.
So call it what you will, the fact that an Autograph might get out without a number grade stamp wouldn't surprise me in the least.
This is not me being anti-Italian or anything like that. I have a pile of these kind of pipes and I love them. But incomplete or incorrect stamping is not uncommon, and anyone who finds a pipe marked "Ita" should presumably neither worry about it nor make the assumption that the pipe in question is some kind of one-off.
There are mis-stamped and unstamped pipes out there in every brand. In my experience, some of the Italian manufacturers do it more often than some other manufacturers. I've never seen a mis-stamped Mastro de Paja, for example, and have seen mis-stamped Dunhills, Stanwells, and Petersons.