Stainless sights--gotta be really early. Just picked it up.
Tim

Tim
My 4” Model 66 (no dash) has stainless sights. It shipped in June of 1975. The serial number is 7K16xx, and I believe it was just before the transition to black sights.
Yes, and the move of the gas ring to the yoke (7K2xxxx).It shipped in June of 1975. The serial number is 7K16xx, and I believe it was just before the transition to black sights.
The (May) 1970 tooling test run were in the K9491xx's.I recall the very first model 66s were in the late six digit K prefixes (no number in front of the K).
The unobtanium production M66's show up in 1973 in the 2K51xxx's.They were made of unobtanium at the time due to LE orders at the time.