Harrington & Richardson used the Prefix AT in 1983.
1871
1980
No way to answer without the serial number.
Harrington and Richardson used serial numbers that started with AM in 1974. The company had similar shotguns being built from 1974 to 1981.
S prefix is 1956.
the topper model 88 is a 1985 model according to the blue book of gun values
More information needed to determine model of firearm.
"BB" prefix indicates 1985
How much is a 60 year old Harrington & Richardson Handy Gun, 410 gauge worth?
1987
1971