Many thanks lrv. Isn't it amazing the CutCo 2203 3/4 from the 30's? is so similar to the 2OT and 3OT examples from 1959? Really only differences is the smooth <slick> bone instead of the stag bone.The removal of the 'Federal' or Bomb Shield.Apart from the 3OT which has small nail nick on the sheepfoot blade the Cutco shares the identical "French" nick with the 2OT's on the Clip Master blade.The word Schrade on bottom bolster was replaced with Old Timer... there is no designated number etched on the Cutco like the pile side etch 2OT and 3OT.....so it took 30 odd years to reintroduce to the line up.Interestingly Schrade re-introduced the smooth or slick bone for the Heritage line up in the 80's.
To sum up from Codger's research the 2OT was pattern #126,127. The 3OT #181,183 the Craftsman shield 2OT was Sears #9530.Cutco # 2203 3/4.
I put the old Schrade Walden 8OT's up as I was going to compare with that 'Bone' 8OT photo Larry put up in previous thread. I believe the swedge is even longer on that Bone 8OT and the Match Strike nail nick is longer by about 4 strikes on that bone 8OT <if you care to count> ..so there were a number of differences between the genuine bone and the Meerschaum ""bone"" 8OT's from 1959 and early 1960's IMHO. Hoo Roo.
Post Script: Schrade did a "prototype" in 1959 of the 2OT where they had identical bomb shield and bone stag scales to the 2203 3/4 and simply had Old Timer on bottom bolster but it did not get to production preferring to run with the ""newer"" 2OT models above.It also had the 4 pins same as 2203 3/4 instead of the 3 pins of 2OT I believe from looking at the photo of one.