Early backs say PAT. PDG., later ones don’t. It is unknown if a patent was actually applied for or why a patent wasn’t pursued. Perhaps the design of Style 6 was too similar to Style 5 and was not considered worth the expenditure to go after a patent.
Baby Ben Style 6 Back 1
Baby Ben Style 6 Back 1
Big Ben Style 6 Loud Alarm Back 1
Big Ben Style 6 Loud Alarm Back 1
Big Ben Style 6 Chime Alarm Back 1
Big Ben Style 6 Chime Alarm Back 1
Back Type 1:
Has "PAT. PDG.” and “MADE IN U.S.A.” Used in the first half of 1949.