I have one of the wooden wedge shaped countertop display cases from the 1970's. The sliding tray holds 18 folding knives. From the picture in a 3/77 dealer brochure and the shape of the spaces, I have identified 16 of the knives. They are 301, 303, 305, 307, 309, 311, 313, 315, 317, 319, 321, 110, 112, 501, 503 and 505. One of the remaining two spaces should hold either a 506 or a 500. Any ideas on which one is more appropriate? The final space is a mystery since it is shaped and a California Toothpick fits perfectly. Did Buck sell a similar knife in the 70's? Can't post pictures here but could email one to anyone interested.