You know, yesterday, I was trying to think of an autopistol chambering in current common use that's older than the .32ACP, and I can't think of one.
The .32 debuted at the turn of the last century in the FN 1900; .30 Luger and .30 Mauser are as old and older, respectively, but neither one is in what I would call "common use" these days. All the older handgun cartridges I can think of are revolver loadings.
Huh. That John Moses Browning guy, he turns up everywhere.