Cornell Publications may have a book on H&R history
"P" prefix indicates 1953
1973
How old is my Topper 88 HARRINGTON AND RICHARDSON GUN serial number
Harrington & Richardson used the Prefix AT in 1983.
1941
1987
"AY" serial prefix = 1982.
1971
1980
M prefix to serial # = 1952 manufacture. Jim
The value of a Harrington and Richardson 7mm Remington mag serial number 52897 depends on its condition. This gun in excellent condition is valued between 125.00 and 200.00 as of 2014.
Immediately after 119437.