I just received my bottle of 1988-vintage Shulton Old Spice AS, and splashed some on today. It seems to be the OS I remember, but it seems to smell WAY different than the current product. I didn't think there would be that much difference, which makes me think that maybe the bottle of new stuff I have is bad.
After rediscovering the vintage stuff, I'll echo what others have said about the Vi-Jon stuff being pretty dang close. The only big difference is the intense alcohol note of the knock-off scent, which fades once it dries-down anyways. Now, all I need to do is hit up Patel Bros. over here for some of the Indian stuff.