Hi There,
There were at least two different stamps used. The two that are
accepted as original are almost identical. The difference being
that one version has "WF&CO. EX" and another has "WF&CO.'S EX."
There are a couple of different size stamps used for the serial no.
stamped next to the Wells Fargo stamp (the serial number was
the same as the serial on the butt).
Cheers!
Webb