Since you prefer a stainless model, I suggest you look for a K frame model.
Egghead just mentioned the M65-1, which was introduced in 1972, a M66 no dash, which was introduced in 1970.
Serial number ranges for the K frames produced in 1972 are:
2K55997-2K99999 ALSO 3K31280-5K6616 AND 4K1-4K1627
The difference between the M65, 3 or 4" barrel, and the M66, 2.5, 3, 4 and 6" barrel, is minimal. The major difference is the M65 has a fixed sight and the M66 has an adjustable sight.
Egghead just mentioned the M65-1, which was introduced in 1972, a M66 no dash, which was introduced in 1970.
Serial number ranges for the K frames produced in 1972 are:
2K55997-2K99999 ALSO 3K31280-5K6616 AND 4K1-4K1627
The difference between the M65, 3 or 4" barrel, and the M66, 2.5, 3, 4 and 6" barrel, is minimal. The major difference is the M65 has a fixed sight and the M66 has an adjustable sight.