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I can not give the exact date of manufacture, however, the model 66-1 was produced from 1977 (change of gas ring from yoke to cylinder) until 1982 (in 1978 the 6" barrel was introduced).

In 1982 came the 66-2 (Eliminate cylinder counterbore and pinned barrel; slight change in cylinder lenght to 1.62"

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17y ago

What else can I help you with?