The serial number prefix of the letters AJ indicates that your H&R model 622 was made in the year 1972.The model 622 was made from 1957-1973.The price range of these .22cal 6 shot revolvers is from 65-150 dollars,depending on overall condition and a good bore.
M prefix to serial # = 1952 manufacture. Jim
"AD" prefix indicates 1967
About 1973
That should be 1975
"AX" prefix indicates 1981
The prefix letter shows the year of manufacture. 1956 is letter S
serial number suggests a single barrel, hinged frame Model 1908/08 shotgun - if so - 1920-25.
Harrington & Richardson used the Prefix AT in 1983.
1973
How old is my Topper 88 HARRINGTON AND RICHARDSON GUN serial number
what letter or letters are in front of serial number
"P" prefix indicates 1953