The typed description means nothing without having it looked at. This is the first I've ever heard about a 1˘ being perforated by his invention. Pretty sure little is known about him and it wasn't even discovered until the 1940's.
The Snow patent has been written up several times including by Ken Lawrence in the American Philatelist (November 1993, page 1020+, and probably other times as well) and recently by Arthur Groten in the American Stamp Dealer and Collector magazine, January 2018.
Anyone who has had a large stack of letters to stamp knows how much easier it is to tear (or cut) the stamps into strips and apply them from the strip. Thus the convenience of coils. Finding a stamp cut in one direction and torn in the other is not uncommon. This stamp has that appearance - whether cut into strips for manual application or for passage through a Snow applicator. The experts will know the features to look for, although the odds are long.