I've had ruana's since 1965 when I worked for the US Forest Service in Plains, Montana which is about 60 miles north of Missoula.
The new Ruana stamp just says Ruana, Bonner, Montana. The old stamp and the one that is sought after by collectors, is R.H. Ruana, Bonner, Montana. the older sheaths also have the RH Ruana stamp with an elk head. The older RH Ruana stamp has ages one can determine by the "M" or the small knife stamp. They are a fun knife to collect but certainly aren't the overall quality nor do they have the options and models that does a Randall. The Ruana Bowie's are the most sought after and can command a big number.
I have an older 21A and they do feel nice and are a real workhorse. Congratulations on your choice.
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Mike Allen
RKCC-CM-086
True West Magazine Maniac
Randall Collector
Behring Made Collector
Ruana Collector
Glock Fan
NRA- Life Member since 1975
mikenlu99@aol.com