Silencer
I thought I saw an old Sionics in .32 (for a Skorpion?), but they don't show it on their web sight. I think the WWII Welrod was in .32 (and the DeLisle in 45), but they were all silencer with an action attached.
You may recall one of the early James Bond flics where he was given a PPK in .32 to replace his Beretta .25. Q told him that it had the impact of a brick through a plate glass window (or some such). He was unconvinced and tried to smuggle the .25 (unsuccessfully) out of M's office. He did have a silencer for the PPK, so I'm guessing that, at least in the movie/fantasy world, a .32 silencer exists.
Good luck in your search.