Standard Catalog of Firearms, Blue book of Gun values, on line auctions, gun shop
Impossible to value with just the sn and no other descriptors
Pistol made by Hopkins and Allen @ turn of the century or before.
Cornell Publications might have a book with that information.
about the the late 1800s
No definitive sn data published.
SN's were not required at that time. If it has one, look on the butt or frame.
Hopkins & Allen Company.
They made thousands of them.
£150
The Hopkins & Allen 832 was chambered in .32 RinFire Short.
Unfortunately, a serial number ALONE does not impart any information. H&A made rifles, shotguns and handguns. The company closed in 1916.
You will need a professional appraisal.