I do not know the manufacture dates, but I have the one my dad bought brand new in 1967
Walt Mossberg is 64 years old (birthdate: March 27, 1947).
i would contact Mossberg directly.
The Mossberg 800 series was made between the early sixties to late seventies.
unknown
They were made from 1958-1980.
35 years old
I bought mine in April of 1970
The 183 series was made from 1953-1956
60's-80's
The Mossberg Model 151-K was made for two years only: 1950 and 1951.
The Mossberg model 185D bolt action shotgun was made from 1947-1959.
Your westernfield model M822 was made for montgomery wards(westernfield) by mossberg gun manufacturing company.The mossberg model designation for this gun was the mossberg model 640K.these were made by mossberg between the years 1959-1984.