depends on if it still works
Double barrel musket shotgun
You would first need to provide all of the markings found on the gun.
I do not know too much about the value of such but I have one, a ten guage double barrel with external hammers that my dad bought from a pawn shop in the 1950s. I have no wish to sell but would also like to know the history .
The firm of Francois Dumoulin & Sons has been a maker of firearms in Leige, and now Herstal Belgium since the late 1800s. Below is a link to their company website. They may be able to provide you with additional information on your shotgun.
The J. Stevens Arms Company was a prominent firearms manufacturer in the late 19th and early 20th centuries. The Springfield double barrel shotgun with a hammer was likely produced by J. Stevens Arms Company in Chicopee Falls, Massachusetts. The 16 gauge shotgun was a popular choice for hunting and sport shooting during that time period. The specific history of this particular shotgun would require further research into the serial number and production records of J. Stevens Arms Company.
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ELG is a mark of Henri Pieper of Belgium mid to late 1800s and the diamond with the number 12 is a 12 ga look for a letter P or H or HP maybee Cie as well
Some of these may date to the 1500s. The double barreled gun was simply two regular barrels, joined by solder. A later form from Germany in the 1800s consisted of 2 shotgun barrels plus a rifle barrel- known as drillings, from the German word for 3.
Actually made in the early 20th century. Model 19's are being traded in the $150-$200 range for a standard field grade gun. Marlin did offer these in different grades (G is not the grade, it's a version) and the higher grades are bringing more money to Marlin collectors. As a side note, the Marlin 19 is not suitable for firing with any form of modern ammunition.
in the 1800s, the passenger would carry a shotgun to prevent robberies
Many "Richards" branded shotguns in the late 1800s and early 1900s imported to U.S. from Europe. Some high value Westley Richards guns were made in England, other rather valueless English and Belgian guns came over also. Be careful not to shoot these without inspection by a gunsmith.
Oh, dude, you're asking about a Laclede Gun Co. double barrel 12 gauge shotgun with hammers? That's like asking me to recite the entire history of the universe in one breath. All I can say is, it's a shotgun, it's got two barrels, it's a 12 gauge, and it's got hammers. So, yeah, there you go.