Seldom exceed 75 USD
That should be 1975
About 1973
No way to tell.
1941
More information needed to determine model of firearm.
1973
How old is my Topper 88 HARRINGTON AND RICHARDSON GUN serial number
Seldom exceed 100 USD
Harrington & Richardson used the Prefix AT in 1983.
"P" prefix indicates 1953
$50-100, depending on condition.
1987