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Mr. Mosesmanaged to take the tobacco leaf and manufacture many different products - from plug to snuff. Typically a factory provided ONE type of product but it could be processed and sold in many forms. You couldn't smoke snuff in a pipe or roll it - you couldn't chew tobacco that was processed for cigarettes. With time the factories were looking to reach greater markets and utilze all of the plant and excesses. Plug was a form of chewing tobacco - most often combined with ingredients to sweeten or enhance the taste like fruits, honey, and other flavoring. Plug was about the cheapest form of tobacco other than "clippings". People with "armpit" money would alternatively smoke the chew so to speak. The companies then packaged "cut plug" which could be smoked. "Granulated" cut plug was a natural extension and offered to the public so as to fill their pipe OR roll into cigarettes. This is off the top of my little head - I have doccumentation and better identification somewhere for the terms if they are actually needed - but I think not. Penn tobacco was a widely marketed brand and offered in MANY different style containers.
ANOTHER AVENUE OF EXPLORATION might be the pocket tin itself - American Tin Can Co.(?) or sumptin else? It reminds me of the Paul Jones (?) cantainer 
. I don't have a Penn's pocket tin to look at but will finger thru some books to see if I can find anything that might provide another link.....