To my knowledge, Sal's maker mark is on every version of the Para/Para 2. Usually that seems to be the way it works when he chooses to put his mark on a model. The only exception I can think of is the Stretch 2, which has his mark on one version I know of, and not even all of those--also the Native 3 has it but not the native 4. But for other series like the UKPK line, Caly line and Temperance line, I believe he has his mark on every model