Does not exist. You might find a magazine at egunparts.
Harrington & Richardson did not make a Model 1900. Hopkins and Allen did.
Harrington & Richardson used the Prefix AT in 1983.
Your harrington and richardson model 900 was made between the years 1962-1973.
I purchased a new Harrington & Richardson 12 gauge model 088 from K-Mart in 1980.
between 1949 and 1952
1871
36GA
25-100
10-110 usd
2013
How old is my Topper 88 HARRINGTON AND RICHARDSON GUN serial number
model 158 12 gauge shotgun