M prefix to serial # = 1952 manufacture. Jim
"P" prefix indicates 1953
"M" prefix indicates 1952
1941
1973
How old is my Topper 88 HARRINGTON AND RICHARDSON GUN serial number
Harrington & Richardson used the Prefix AT in 1983.
About $150-$175, depending on condition.
An H&R Sportsman with that serial number was made circa 1937-38. Value depends upon condition: Exellent $300 +/- $25, down to fair $125.
You will have to contact H&R 1871 Inc. to find out.
1987
"AY" serial prefix = 1982.
the Iver Johnson website has some sn info IIRC