"PR" in label matrix denotes a pressing.
Runouts are etched.
"W" etched in runouts denotes that an Audiodisc lacquer blank was used to cut this record.
"LW" etched in runouts (L in cursive) denotes that made some of the metal parts used to manufacture this record.
"AT" etched in runouts denotes lacquer cut at.
"aB" (cursive small A with the tail ascending to the top of a capital cursive B) etched in runouts denotes lacquer cut by Al Brown.