I have a Leupold 3x9 AO. The serial number on the scope starts with an M, so it dates to 1981. It has no model markings. Best I can tell, it would be a Vari-X ii.
I had never heard of, or seen, a Vari-X ii 3x9 with AO before. My assumption is that this must be one of the very early Leupold variable scopes with AO. I did find a picture of the 1981 price list, which listed the Vari-X ii 3x9AO at $264.70. This was the only variable with AO in the price list.
Does anyone have listings or catalogs which show when Leupold introduced their first variable AO scope?