You need to provide the serial number
Hopkins and Allen purchased Forehand Arms in 1902, so sometime between then and 1915 when the company closed.
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If the shotgun is marked Hopkins and Allen Manufacturing Company, Norwich Conn. it was made between circa 1880-1885 and 1898. If marked Hopkins and Allen Arms Company, it was manufactured between 1898 and 1915. No records are available to give a more exact date of manufacture.
If it is Hopkins & Allen MFG Co, sometime between 1868 and 1898. Hopkins & Allen ARMS Co would be from 1898 to 1915. A 16 gauge would more likely (but not certainly) have been made after 1900.
1870-1910 or so
1884
A copy of the Blue Book of Gun Values might help.
The Hopkins and Allen 922 long rifle with serial number 70 was likely made around the year 1900. Hopkins and Allen produced various firearms during that period, and the serial number can help approximate its manufacturing date. For precise dating, consulting a detailed reference or firearm historical records would be necessary.
The 10 gauge Hopkins and Allen Y8072 is a shotgun model that was produced in the early 20th century, primarily between the 1890s and the 1920s. The specific age of an individual gun can vary based on its manufacturing date, which is typically found on the barrel or frame. If you have the serial number, you may be able to find more precise information regarding its production year.
Provide the serial number.
10-1000 USD depending on specifics