I again think it was centered around mechanization & economics. But um one may have to narrow the field by hammer & hammerless as well as H.A. Lindner & non-Lindner. I would have guessed that the Daly-Scott hammerguns would have been non-through lumps but even those I believe to be mixed? Will take some time to sort thru all the examples.

Kind Regards,

Raimey
rse