B would be a 1950 manufacture.
Is the gun stamped Utica, NY; Chicopee Falls, MA; or Westfield, MA?
Utica would be 1947 or earlier
Chicopee Falls would be 1948-early 1960
Westfield would be 1960 or newer.
IIRC the Model 220's were made from 1938 thru the 1970's.
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