Both the original Schrade Safe-T-Grip knives and the new Chinese copies are 400 series stainless steel. There are vast differences in the quality of heat treat and quench, and cryo treatment. The 140OT Trail Boss is hollow ground.
Being produced beginning in the 1993 - 2004 period, all of the original knives in this series sport Schrade+ stainless blades hardened to 56-59Rc. Schrade+ steel was actually a trademarked name used for at least two different stainless steel alloys. First used in 1993 was 440A. Then a change was made to 420C. As of this time, there is conflicting information about when this change took place, but it seems to have been sometime after the 2000 production year.
In 1995, the 140OT Trail Boss pattern was added to the series (eventually consisting of ten patterns including three lockblades and three fillet knives) and it listed for $39.95. It had a 10 5/8" overall length, making it the largest hunting pattern in the TPR line, and weighed 6.6 ounces. The blade was a hollow ground Schrade+ stainless 5 5/8" clip point with two fuller grooves. This was one of the very few Schrade knives ever to use fullering. The green molded TPR handle was the same component used on the previous Safe-T-Grip knives The sheath was 10 3/8" overall (#7050123). The tangstamp was SCHRADE+ over U.S.A. 140OT. It was produced a total of nine years. This pattern is one which may be found with the black handles and 140OTB designation.
Codger