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Take it to a gunsmith
1900, give or take a couple of decades
Have it examined by a gunsmith.
Seek the services of a good gunsmith
Between 35-60 dollars.
Hopkins & Allen made inexpensive handguns and good quality, utility shotguns from the late 1800's through the early 20th century. There is no definitive way to date your shotgun, but you can realistically range from 1880-1920. There is no collector value attributed to the H&A guns, and resale prices on the single-barrel shotguns invariably top out under $100. PLEASE have the gun checked thoroughly by a reputable gunsmith prior to shooting.
Not listed in any reference I have seen.
numrich
Model 1901 Iver Johnson, semi-hammerless, automatic ejector single gun.
The name with "Tool Co" at the end was only used from 1887 - 1916.
No, Anthony Hopkins is not single.
Can't be told with just the sn.