Depending upon overall physical and mechanical condition, that rifle will be worth, at RETAIL, between $75 and $150.
Have you tried a web search? Local Library? Do a web search on Harrington and Richardson Books and you will find some sources.
200 or so
100 or so
10-100 usd
The Harrington Richardson 20 gauge single shot shotgun, Feb. 27 1900 is valued at $75 in poor condition. In good condition, it is valued at $200.
H&R and New England Firearms are one in the same, NEF holds licence to the old Harrington & Richardson brand names, if it is a H&R Huntsman 45 caliber black powder single shot rifle 28" round barrel then the value is in the $100 to 125 range in 90%+ condition.
H&R / Harrington & Richardson
$75-125, depending on condition.
1901 single barrel shotgun, washingtion
Made between 1948 and 1952, these were nice entry level single shot rifles. They currently sell for $100-$125, depending on condition.
50-100 USD
50-100 USD