The Maxim baffle design had been eclipsed by WW2, when screening, eyelets and stacked baffles were more in vogue, (look inside a suppresed Sten or Grease Gun sometime). The "third generation" rubber and urethane "shoot through" baffles and muzzle expansion chambers came along in the 1960s and were present in the Sionics and other cans. The can pictured, with the characteristic liberal use of knurling on the outer surfaces is representative of this era. Roy may have very well used something similar.
Remember that Mitch WerBell worked for Dominican Dictator Rafael Trujillo at that time, so who knows?
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