That A&F fishing knife is almost identical to one I have stamped Lamson & Goodnow who are part of the Dexter-Harrington Co. that purchased the John Russell Co. years ago. I also have a John Russell Green River Works sticker that I believe was a re-issue in the 1970's.The etch looks too modern to be an original 1870's knife.
Speaking of Abercrombie & Fitch(the outfitters;not the clothing idiots)I have an old Joseph Rodgers folder that has checkered horn handles;a built-in scale and other fishing related blades that was made for them.
Also I have a John Russell thistle handled knife that was made for Iver Johnson Sporting Goods of Boston(another outfitter that also made firearms).
That farmer's jack would have probably thrown me for a loop as well.Although it looks good at first glance and could probably be authentic the bar shield and fluted bolsters would have raised red flags with me.I've never seen any Russells with either of those features.
That cattle knife is still a beautiful knife and I agree there should be a law against "incompetent use of a grinder"
... great point - I no doubt think grinders/dremels should be illegal and outlawed for knife blades 
Attached below is the same stamp from no doubt a good knife but not sure if that is what you were looking at as well...
- that is just exactly what I would be looking for to add to the pile someday 
That kind of knife brings together my two halves 
