I've used a pocket holster for some time and prefer it. But for those times when I want to carry OWB, well, it has been a long search. I think I have finally found a holster I like for the 637. The Bianchi Lightning. Picked one up over the weekend.
The strap is a REALLY tight fit - I think the holster was orginally made for the old wooden stock grips on Chief Special's. Perhaps Bianchi should change the manufacture to accomidate the newer rubber grips?
Anyway, the holster is still breaking in, but I really like it.