Here's some info i found on an earlier post (2007 i think) courtesy of Codger ,
One of the predecessors, the 3 1/16" long #C2533 3/4 SQ was listed in the 1934 catalog with nickle silver “Washington bolsters”, and Bone Stag handles. It had an oval shield, and no text stamped on the rear bolster. A more direct appearing ancestor, or rather ancestors, seem to be a series of jackknives from the earlier 1928 “Catalog E” itself, the #2202 (ebony handle), #2203 (Bone Stag handle), both at 3 ½" long with spear master blade, and #2203 3/4 with a clip blade and Bone Stag. All three used the “Federal” or “bomb” shield, and the name “SCHRADE” stamped across the rear bolsters. The 2OT had a closed length blade of 3-1/2", a 2 ½" clip master blade and a 1-7/8” pen blade. The tang stamp is SCHRADE / WALDEN / N.Y. U.S.A. on the mark side, and 2OT on the pile side of the master clip blade. The pen blade is unmarked.