There are some published serial number lists.
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.
Blue Book of Gun Values
I find no Harrington & Richardson S/S shotgun manufactured since 1885.
Made through the late 1940's - mid 1950's. Value under $100.
Try Gun Parts Corp
The Harrington & Richardson 349 Gamester shotgun does not use a clip. It has a tube type magazine that is a pemanent part of the gun, loaded by sliding shells in from the bittom of the gun.
Bill Goforth has an excellent book on the H&R shotguns. You can do an internet search to find a copy.
Unlikely that detailed sn data has been published.
about 80 bucks. I have seen them go for 130, and have seen them go for 2 for 50. Just gotta find the right person.
Ypu might try Numrich gum parts. They have the largest inventory around..Try gunpartscorp.com. Maybe they can help.
Please list all the markings on the shotgun. Harrington & Richardson were producing hammerLESS double shotguns as far back as 1882. email@example.com
TRY THE BLUE BOOK OF GUN VALUES FOR PRICES..
If you took it apart without an owner's manual and now can't get it back together, find a gunsmith.
Your harrington and richardson model 900 was made between the years 1962-1973.
An inexpensive shotgun made by Harrington and Richardson in the late 19th or early 20th centruy. . Value 25-150. Best thing to do is hang it on a wall.
The letters AY which proceed your serial number indicate that your shotgun was made in the year 1982 by Harrington and Richardson.The disassemble of your shogun,I am not sure about.You may find a manual on E-bay,gunbroker.com,or at gunshows etc.Good luck in your search.
Have you tried a web search? Local Library? Do a web search on Harrington and Richardson Books and you will find some sources.
You will have to measure the inside diameter of the barrel to find out if it is not marked.
Try the following link. I saw it there. www.gungarage.com/gunmanuals.htm
Gunshops, gunshows, and you might try Numrich at gunpartscorp.