Hmm, I never thought about it (even though I saw your earlier posts), but I think I am in possession of one as well - mine is an AC which apparently means that it was made for export to Canada, it is also a '75, and it also has the o! It's even more confusing because it's a doubleneck and each headstock is stamped differently - one 75, one AC - but both give the number, o25, though like yours it looks like 025.
I'm sorry I don't have any news to contribute, just wanted to let you know you're not alone!