Your serial number is from 1974. 10-6 is specific to the Heavy Barrel variant, 10-5 is a standard barrel. 10-5 and 10-6 were manufactured concurrently until 1977 when the 10-5 became 10-7 with the gas ring change, and 1978 when the Heavy barrel became the 10-8 with the same change. The 1962 date the seller gave is simply an error by him. If the stocke are original they would have been "Diamonds" in 1962.
Assuming the next "dash" change superceeds the immediately preceding dash is a very common error.
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Gunsmithing since 1961
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