H&R made thousands of 22 caliber firearms over many years. Good questions equal good answers. Link below will give you some info on H&R.
1971
60-100 yrs old
1987
More information needed to determine model of firearm.
"BB" prefix indicates 1985
No way to answer without the serial number.
Harrington & Richardson used the Prefix AT in 1983.
S prefix is 1956.
Check out Cornell Publications. 'H' prefix indicates 1948production year
No records in the public domain.
How much is a 60 year old Harrington & Richardson Handy Gun, 410 gauge worth?
1871