The blade shape shown in # 6532052026 is the Mode 7: "Fisherman-Hunter." They came in 4 1/2 and 5 inch blades of 3/16" stock. That one went for $435, so that is what that one was worth to the buyer.
Randalls bring very large prices, since Bo stopped making them himself. Of course, Bo didn't make every knife which they shipped, but one could always imagine he made YOURS.
The "Fisherman" first appeared in Bo's catalogue in 1944, as a smaller version of the "Hunter." It was priced at $17.50 and even then came with a sheath including a pocket for the hone. This makes me believe your sheath might be a replacement. This is the knife Bo himself carried the rest of his life when fishing.
Enjoy your knife. They are made to last several lifetimes.