I agree with Wotan. I have never seen this particular TM on any authentic 3rd Reich edged weapon. I have however seen it on the "Atwood" 60's era parts RAD leader daggers that had the very thin blade.
IMO this makes the " Fat Man" questionable as a "period" piece. Now if I could see this TM on another period blade I might change my mind.

MAX & OVMS Life Member, MAX Bd. of Experts. GDC Platinum Dealer. Collector since 1955.