Unlikely that detailed sn data has been published.
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.
serial number suggests a single barrel, hinged frame Model 1908/08 shotgun - if so - 1920-25.
H&R / Harrington & Richardson
$75-125, depending on condition.
single shot 30 30 with 32 gauge dart barrel have barrel need action
Seek the services of a good gunsmith
fifty or one hundred dollars.
Under $100.
50-100 USD
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.
Seldom exceeds 100 USD