Thanks to you all that have commented so far. Randy, my interest in putting one together is a result of a so. mtn rifle (40 cal.) I've been slowly assembling. Anyway, some of the distinguishing features I've been able to detect from various sources seems to be (1) may be plain (read as little scrimshaw present), but very well constructed; (2) use of antler or bone for the tip seems to be done often, but not always; (3) use of both dark and whitish horns; (4) use of horn as applied bands or rings; (4) somewhat bulbous base plugs, either plain or as a beehive style; and (5) may or may not have applied collars or integral ones for that matter.
However, the search continues and the above are only what I can determine from what I've read or seen. I'm sure there is a forum member somewhere that can give us all some more insight.