The Remington Model 550-1 production started in 1940, then stopped during WW2, and production resumed in 1946 and continued until 1970. Models produced from 1968-1970 have serial numbers, pre-1968 don't have serial numbers, but all models have a date code stamped on the barrel. D code = 1960-1970? C code = 1950-1960? B code = 1940-1950? Not sure about the date code dates.
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