These and the G.W. Stone equivalent were among the first to trade on the Randall legacy back in the 1960's. They led to the custom knife trend that began then.
Stone used 440C steel with his own advanced heat treat. A man who worked with Bone told me that they used Graphmo (brand) tool steel, prob. the same as 1095.
I don't like the more tapered shape of the blade as well as the original Randall Model 1, but the Bone and Stone examples don't have the dip in the blade spine just before the guard that I don't like on the Model 1.
You can get the same basic blade shape from Randall without the dip if you order the Model 5. The false edge/clip can be honed on request.
Randall handles are a bit short for many hands to take the full length Fairbairn-recommended grasp for slashing and thrust strokes. That's one reason why many like the longer Bone handles.
I see that the knife pictured was a safe queen. Some did see action and Stone showed me a letter from a Spcl. Forces soldier who said that his Model A worked well when his camp was being overrun by VC. One hard stroke of the eight-inch blade took off a Viet head. Randall also received similar testimonial letters.