I thought I remembered the round, flat, four bladed screwdrivers from S&W revolvers in the late 1980s or early 1990s. So I looked in the SCSW 4th. Sure enough, it shows the four blade type from 1988-1991, and then a two blade type from 1991 on (until when, I don't know).
The last new S&W I bought was in 1989. I purchased a brand new Model 36 LadySmith for my daughter's 16th birthday. It might have had a flat screwdriver in the plastic box. She still has it, so I'll have to ask her.
The last new S&W I ever bought for myself was a Model 14-4 in 1983. It, of course, came with the fluted aluminum handle SAT. It is in my safe, still NIB, so the SAT is still with it. I've lettered it and it shipped in July 1980. I guess it sat on the dealer's shelf for three years!