RWTF, I looked at all the obvious references that I had (and you probably have) and couldn't find an answer.
They all agree that the ctg. dates from 1902, but don't give any "end date" for the production of rifles in that caliber.
I would say that your estimate of the late '50s is pretty close, but keep in mind that at least one "special edition" of the '94 in .32 Spl. was offered later than that, in the 1970s, I think. If I remember correctly, it was one of those goofy "big lever loop" models, but I can't remember what, if anything, it was supposed to commemorate. Probably Winchester had a few .32 barrels they needed to get rid of, and they knew that such a "collectors edition" wouldn't get shot anyway (You may sense that I have a low opinion of guns made only to "collect"....).
As a side note, I can't remember any non-Winchester .32 Specials ever made except some Marlin 36s (not too common), a few French sporters based on the MAS 36 bolt action, and a VERY few French and Belgian double rifles.
Not much help, but maybe a REAL Winchester guy will chime in.
