As an additional observation, I have observed horizontal RMK stamped sheaths with no numbers on these early sheaths, one was an example in Sheldon's book.I don't have the book with me, will post it later. I think it was placed horizontally because there was no room for vertical placement.
Capt Chris mentioned a horizontal RMK stamped sheath earlier. Is this the case Capt Chris, or is that stamp on a standard sheath where there is plenty of room either way.
Again, I am not saying that they are not out there, that's why we are doing this project, to see if they are common. This project may determine if the sheath maker was consistent with the way he or she oriented the stamp.
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Sam Granade
RKS Member #5700