Wes,
If I have the time frame correct, the issue of the Rohm SS daggers was for three months or perhaps less and the switch to the small trademark (judging by numbers that have turned up) was early.
Perhaps some large trademark pieces were intercepted before being given out? Also, there is a theory that many were returned to the factory for regrinding, but the factory just switched to new blades and kept the old ones. Who knows ?
