does any one know anything about a hopkins & allen sigle shot falling block 12 ga. i got one about 2 mounths ago

H&A made fallingblock rifles in calibers from.22EF to .38-55 from about the late 1880s up to early 1890s. They acquired the Bay State Arms Co. operation in 1886, makers of quality lever action falling block rifles, and H&A continued the manufacture of these guns under their own name. They had blued barrels, case hardened frames and walnut stocks. They also made some with an extra matching 12 ga. shotgun barrel, which is what you have. Somewhere in it's past life the rifle barrel has gone missing. These are uncommon guns, but so is anybody who wants one, so the collector market is very slow on these. Ed #15

do you know what one in 12 ga is worth

The falling block shotgun in 12,16 & 20 ga were made in both the Merwin & Hulbert and the Hopkins & Allen name periods.
Two different frame sizes, one for the 12 and the slightly smaller for the 16/20 ga. There was an even smaller shotgun frame in the M&H that was used for the 44XL shot cartridge. Early guns had the lever take down on the right side,,later had a ring.

H&A came into being in 1902 after the bankruptcy of M&H. They too offered shotguns in 12,16 and 20 ga. In 1902 they sold for $8.00

Any could be had as a single barrel outfit/shotgun only for the above price. Or could be ordered with an additional rifle caliber barrel (within reason) for additional money.
Even rimfire calibers could be had. The link between the lever and the breechblock on those guns has two lower link pin holes. Moving the link pin raises or lowers the position of the breech block in the closed position to allow the firingpin to strike either the centerfire or rimfire cartridge.
That feature was a carry over from the M&H days of mfg'r. when they first offered that feature in the late 1890's.

H&A also reintroduced the 44XL shotcartridge singleshot to the line in 1906 ('Junior' Model single shot).

H&A stop mfg'r of sporting guns in 1915 to concentrate on their contract with Belgium to build M1889 Mauser rifles. They did produce some but they went backrupt in 1917 and never fulfilled the entire contract. M'89 Mausers so marked on the receiver ring 'Hopkins & Allen/ Norwich, Conn' are quite rare and bring good money especially if unaltered.

The US Govt and MArlin took over the factory at that point to mfg parts for the new BAR. Marlin's New Haven plant did not have sufficient machinery to make the parts that Marlin had contracted to make.

Marlin bought H&A assets in the early 1920's, but did not buy the buildings. They were sold to a fabic/textile mfg'r who's name I can't recall.
The H&A name was Marlin's property till after WW2. They sold that name to a guy named George Numrich and he used it to lable muzzle loading rifles and pistols mfg'd by and for his Numrich Arms Co in NY. Probably more than you ever wanted to know...

I've seen the 12ga shotguns priced in the $100 to $300 range. An extremely fine condition one may net more money but as opoefc says there just aren't alot of people looking for them. The rifles do bring some interest and money though.

thank you both very much i think i did good then by buying the gun