2-piper

My gun has a two position safety also. I have seen at least four Lefevers with bushed firing pins. All seem to be of the same vintage but as Lefevers serial numbers do not always go in order you never know. Two I know the serial numbers for sure and they are near yours in age. Maybe Lefever tried the bushed firing pins as a feature and it was later dropped. Like drop points they serve little function to most users and may have been a short time selling feature that was deemed unneeded.