I've been rooting around the house finding a lot of stuff I've had but subsequently "lost" in various drawers and boxes.
Here are a couple of Buck knives I bought from a little Pawn Shop in Oceanside California in 1984-1985. The shop was owned by Harry Camphuysen and was a hangout for me, the gunsmith was a great guy as was Harry and the other fellas that worked and visited there.
The first one is a Buck 184, it's the abrasive "sand" blasted model, bits of impurities in this process prompted a change to a different method in short order as I understand. There were a few of the prototypes around, some really large examples, machette like in size, but I didn't buy any of them. I bought three of these giving one to a medical doctor I was stationed with up in Oakland, CA and another to a retired Marine Warrant Officer for use as a survival knive on his son's light airplane.
The other knife is a prototype of the Buck Titanium (186). This knife has a Buck 110 blade (stamped BUCK 110) with a Phrobis stamp on the opposite side of the blade. The handle had only the Phrobis stamp in place of the Buck logo.
Here you can see the Phrobis stamps.
Here's an article and website I ran across just the other day after I re-discovered my knives.