Hopkins & Allen were in the low to mid priced business, primarily "hardware" store guns. Not particularly collectable and generally thought to have been made to a lower standard of quality than the big six names of American SxS production.....Fox, Parker, LC Smith, Ithaca, Lefever and Remington.
The company was out of the shotgun business by 1915. Pre-1898 H&A arms are marked Hopkins & Allen Mfg Co. Post 1898 are marked Hopkins & Allen Arms Mfg Co.
Without photos, in working condition, this is likely a $200 to $300 USD gun in the US. In Canada, which generally has lower values for old SxS, I'd guess it's still in the $200 Cdn range.
The caveat here is there is very little in the way of description on which to base a price estimate. Functionally impossible without good photos. But it's no valuable gun sought by collectors.