H&R made it
1969
IIRC early 70s
Go here for some information - http://www.littlegun.be/arme%20belge/artisans%20identifies%20q%20r/a%20robar%20gb.htm
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.
S&W can tell you when it left the factory if you call them.
50-250 usd
150/350 usd
10-100 usd
50-200 US Dollars
50-250 usd
Crosman no longer makes the Model 622. It was in production from 1971 to 78. I don't believe you can find one in a store anymore.