My two cents as far as tang stamp's go:KnifeSlinger#81 wrote:
1946-73 is the general era for schrade walden but they started putting usa on the stamp around 1953-54. A schrade walden from 1946 to 1953-54 would be stamped.
SCHRADE
WALDEN
NY
I re-post the generally accepted chart where the "1946-1973" date comes from. The chart is from a "Knife World" article in June 2004 called "Schrade - 100 Years of Markings" by B.K. Brooks. I think chart should be regarded as a guideline and not gospel truth in all circumstances. Even the author was not sure it was definitive fact.
I searched my collection for a pattern with the "USA" stamp from 1946-1959. I only found one suitable example. The 849 is a pattern that has limited production dates.
The Schrade Walden 849 is listed first in the 1955 price-list and then the 1957 catalog. It is last seen in the 1959 catalog so that stamp was definitely used in the mid to late 1950s.
I also have earlier Schrade Walden examples such as 709Sha and 946Sha that do not have USA stamped on them.
Take this as you will. All I'm saying is that I personally don't have any examples that break the guideline stated by KnifeSlinger#81. At the same time I can totally see why Charlie said 1946-1973 for Ivoryman's very nice new knife.