Excluding rear and front sight assemblies, and grip set assembly, please identify parts in S&W Model 60 3-inch that are not manufactured of stainless steel. If there is any sort of differentiation based on "60-xx" variation, please identify those altered/adjusted parts — before that alteration, and after it.
With the very earliest (1965-'66 production) model 60s, every metal part was stainless steel by report. Soon after this, flash chromed carbon steel hammers and triggers were introduced, then eventually these went to MIM.