Balislinger, there are some other differences in the early AFOs. Most notably, as can be seen in 2nd photo, is that the blade pivot pin screws directly into the aluminum handle. Whereas the 9000 models had a barrel screw. Also, the blades on the early AFOs were true satin vs. the bead-blast of the 9000. There seem to be many variations of the blade markings on the early AFOs, too: completely sterile, only U.S.A., only Benchmade (Bali-Song logo) and U.S.A., with only Al Mar logo and U.S.A., and with both Al Mar and Benchmade logos like this one.
Jamn, if you want a reference on price, e-mail me. One of these sold on Sharperdeals.net auction about 3 months ago. The condition and configuration was identical to yours, it was also serial-numberd.