Pre-agreement, pre-lock, blued S&Ws. I've got a safe full of them, including a couple of Model 29s.
I've got ONE stainless steel firearm, a 3" Smith Model 65. I don't like stainless, but I absolutely could not find a Model 13 anywhere in the Cleveland/Akron/Canton area. So I settled for a 65 when CDNN had them for $299. It was a great deal.
I will NEVER own an S&W revolver with a lock.