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about $100
The question can't be answered without knowing who made the shotgun. Even then, information may not have been published.
Utility grade shotgun, 50-100 USD or so
1900-1930's or so.
Manufactured by Crescent Fire Arms or W H Davenport for H & G Lipscomb & Co. The Davenport product will include the patent date Aug 11 '96.
Double barrel? Single barrel? Model? Need more information in order to be able to answer.
The phone number of the Davenport Public Library is: 563-326-7832.
W.H Davenport was a minor shotgun manufacturer that produced primarily single shot 10 & 12 gauge shotguns between 1870 and 1910. They built some double barrel guns under the "King Nitro" trade name, which were sold by mail order hardware companies. Acme was another trade name for guns produced by W.H Davenport.
not sure
The phone number of the Davenport Historical Society is: 607-278-5149.
Since you do not say, whether your Harrington & Richardson is a pistol, rifle or shotgun and you do not show a letter prefix to the serial number, I can only give you limited information based on a Model 48 Topper Single Shot Shotgun which was manufactured for a period of 14 years between 1943 and 1956. I hope this helps, until you can supply more information on your shotgun.
mossberg