I'm having tefilin written for my son's bar mitzvah, and the sofer told me that today the minhag is to only put tagim ("crowns" or "thorns") on the letters שעטנז גץ throughout the tefilin and nothing else. I know that the Rambam (hilchos tefilin chap. 2 halacha 8) says to add a list of tagim, and the Simusha Rabah has a different list, and the Tur (siman 36) says combine the sets.
Do we know what the actual practice was a few hundred years ago? I actually have my Great-grandfather's tefilin from Russia c. 1910, and they don't have any extra tagim. (They were very mehudar until the ink faded.)
When did this minhag disappear (at least from the standard practice)?