10-130 usd
No way to tell.
50-100 USD or so
60-100 yrs old
That is the serial number- not a model number. Try again.
Need much more info - model number, physical description, caliber, type of firearm.
More information needed to determine model of firearm.
id give you $100
Harrington & Richardson used the Prefix AT in 1983.
1973
How old is my Topper 88 HARRINGTON AND RICHARDSON GUN serial number
"P" prefix indicates 1953
1987