"Men of Steel" is the motto for the 135th Tank Battalion, later
designated 2nd Battalion, 203rd Armor. The unit was part of the Missouri
National Guard/35th Infantry Division. They lost their tanks in
1967.Your items look newer than that....could be ...
Put the "P" at the 12 position......at 3 position is "XVa" for the steel
foundry for the case, at 6 position is "38" for year of manufacture and
at the 9 position is"33c" which I believe is the batch number.The case
is steel with a copper wash. The s...
The info I've read said this variation was often not marked. Do a search
for "Collins & Co. bolo knife" and quite a few sites will come
up.http://atkinson-swords.com/collection-by-region/the-americas/north-america/collins-bolo.html