When Winchester reintroduced th model 12 back into regular production in 1972 they added a Y prefix to the serial no. The gun control act of 1968 required all gun manufacturers to use letter codes. Custom shop model 12's which were still being produced after the 1964 production discontiuence will also have the Y prefix if produced after 1969. Although an excellent shotgun it was not produced with the old methods used by Winchester (post 1972 models) and does not have the collector value of the pre 1972 models. hope this helps. RICH
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