I did a lot of searching and emailing looking for an original 2 screw Worker, and I finally got lucky and caught a BIN/OBO on the bay, hopefully the same/similar will happen here.
I've been trying to get together what I consider to be significant knives in the development of the 'tactical' or modern folder. I have the Worker as mentioned, a version 1 variation 1 Buck 110, an Al Mar SERE 3003, & a Gerber V-steel Folding Sportsman. It's funny, but one I'm having trouble tracking down is a Strut n Cut. I also want an LST from the '81 period. I am also waiting to hear back on a Kershaw mini task, since I am going back and forth on the AO thing. I don't know if KO or Blackie gets the credit for doing it first, but the SnC was the prior production AO knife by a year, while KO/Kershaw are really the ones who made it popular. Then there is tracking down a CRKT M16 without LAWKS for the Carson Flipper, and when I can bring myself to spend the money and actually find one, a Samson ground Bali-Song from around '79.
I don't know what else I am going to look for, but the first production knife with PM steel is a biggie for me, hence the search for the Millie. The only thing that kind of bugs me is that half these knives first hit the market after I was into the hobby and actively buying. If I had great foresight, they would have been sitting in my collection for the last ~15 years.
edit: jeeze, a quick google just showed that a '95 prototype millie went for $99 just in November with only a single bid.