If you took it apart without an owner's manual and now can't get it back together, find a gunsmith.
model 158 12 gauge shotgun
Blue Book of Gun Values
How old is my Topper 88 HARRINGTON AND RICHARDSON GUN serial number
No public records- sorry
Probably Harrington & Richardson
the shotgun takes a 2 3/4 shell
They sell new for $125.00
$50-$100, depending on condition.
The Harrington Richardson Topper 12-gauge model 88 shotgun is not worth a lot of money. There are quite a few for sale online for $75 to $125 depending on the condition. This is a pretty basic gun with no pizazz.
this shotgun was made by Harrington & Richardson and is there model 120.www.e-gunparts.com sells some parts for this gun. searching under Harrington & Richardson model 120 will yield more results for you. good luck.
1930's-40's.
Harrington & Richardson did not make a Model 1900. Hopkins and Allen did.