"P" prefix indicates 1953
Where is the serial number for the Harrington and Richardson Model 900 located?
1941
You will have to contact H&R 1871 Inc. to find out.
the Iver Johnson website has some sn info IIRC
About $100.
1940's-1950s.
Try Gun Parts Corp
25-175 usd
Have you tried a web search? Local Library? Do a web search on Harrington and Richardson Books and you will find some sources.
50-100 USD
1930's-40's.
50-100 dollars
single shot 30 30 with 32 gauge dart barrel have barrel need action