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Pistol made by Hopkins and Allen @ turn of the century or before.
about the the late 1800s
Hopkins & Allen Company.
They made thousands of them.
£150
Try Cornell Publications.
gun shows, custom ammo makers
Try Hopkins & Allen. Depending on condition, anywhere from $25-100.
Impossible to value with just the sn and no other descriptors
Cornell Publications might have a book with that information.
Standard Catalog of Firearms, Blue book of Gun values, on line auctions, gun shop
10-100 USD or more depending on specifics.