i have one and it is stamped made in japan
The manafacturer is stamped on the off hand side of the reciever .shouldnt be any problem who made it. Just look top center of left side reciever
describe the type of shotgun and recheck the serial number
Hopkins & Allen
If it is a double, remove barrel and you will see it along with serial #.
nitro hunter shotgun single barrel with exposed hammer stamped belknap hdwre and mfg serial 5516
Wards Hercules 410 was made by different manufacturers through out it's history. The early models from the 1920's had no model number just "PROOF TESTED 410 GAUGE" stamped on the left side and "SELECTED FORGED STEEL" stamped on the right side of the barrel. Model numbers were stamped on later guns. They usually don't fetch much $$
triumph was a shotgun line made by Crescent arms for Sears and Roebuck. The guns are not very collectible, but in good shape may bring a fair price. The gun is probably a single shot break open with Triumph stamped on the side of the action. If so it is probably nothing special, though being a 410 helps the value a bit.
Can't be answered as asked