Alright more research than was probably required but...
The Roth Carpet Company bought the building that housed the Standard Cigar Company of Penn. which was @ 4035 Liberty Ave (it's now used as a small theater/arena I guess) not sure when though. If I had to guess the St. Patrick's Day flood in 1936 put whatever cigar companies that survived the union lockout out of business 'cause 4035 Liberty Ave is right by the river...
Interesting stuff, not what I planned on learning today at all heh. Any way, that puts your cigar somewhere between 1910 and 1936.
edit:
Surprise like most brands, I guess Dry Slitz was purchased by someone and at this point is being made in San Jose, Costa Rica by RSL Blunt Production S.A. (or for a time was)