Ouch that hurts stop twisting my arm. I give up here they are.

My Collection

243A December 1946, 413G February 1969 My Grandfathers, 220F May 1971

Same 220F, 425E March 1976, 220F April 1972

220F from previous pic, 425F March 1983, 228H November 1974 My Grandfather's, Clam Shell Case February 1980

243A

243A Vent

243A Collar

243A Date 0 and 2 are clear but there is a faint line beside the 2 leading me to believe 12
Any help with the 243A is greatly appreciated.