No way to answer without the serial number.
Harrington & Richardson used the Prefix AT in 1983.
S prefix is 1956.
1871
The Harrington and Richardson Model 1908, with the serial number A441113, was produced around the year 1915. Harrington and Richardson manufactured this model between 1908 and the early 1920s, and the specific serial number indicates it falls within that production period. If you need a precise year, it would require more detailed manufacturer records or resources specific to H&R firearms.
1980
1971
1987
Harrington and Richardson used serial numbers that started with AM in 1974. The company had similar shotguns being built from 1974 to 1981.
40's and 50's
the topper model 88 is a 1985 model according to the blue book of gun values
The H&R model 925 second model was made from 1964-1972,The third model was made from 1973-1978.The first model 925 defender was produced from 1946-1947.You did not state which model defender you have?
I THINK your H&R 922 was made in 1948. In 1942 they added a letter prefix. changing to double letters in 1961.