Right on Lofty. The scarce Ruanas are not marked or have the small knife stamp. The last of the Rudy made knives had the R.H.Ruana stamp but no M stamp.

On a side note, I gave my grandson a newer Ruana stamp a few years ago. He was with a buddy of his that shot a bull moose in North Idaho this past fall. There were 4 different knives in the group, but they all wanted to use the Ruana when it was their turn to carve on the moose.

Pap