This may be a simple question for some, but I have been told that all Model 66 revolvers were made out of stainless steel. I looked at a 4 inch 66 no dash a couple of days ago, and it sure looked a lot like a nickel plated steel version. It had the combat grips with wide hammer and trigger. The gun did show some signs of wear (not abuse) but price seemed right at 300. Were there actually some 66's made that were not stainless?