I don't know.
But a number of years ago a local gunshop had one of them and a 6" stainless Security Six, both for $229, both all but new. I looked over the 9mm Speed Six for a good long while then thought, "what do I need one of these for anyway; I'll never carry it and the 9mm is a pipsqueak round I generally loathe" and got the Security Six.
It may have been wiser to have bought the other one, at least if I was thinking about selling it anyway. Oh well, I still have a great gun! And a SP101 to carry.