rudder/flag safety until the postwar transition period. rabbits foot/clamshell during transition and around 48 switched to what we think of today as the model 70 safety. There is also a Tilden safety that started as an aftermarket part that eventually winchester made a factory option, I believe. It converts the left side rudder/flag to a right side safety that functions as the later two options do on the right. I have one that I'll post a pic of later