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There is no way to tell the gauge from the serial number, and that may not even be a true serial number. Diamond Arms were made by several manufacturers for distribution by the Shapleigh Hardware Company of St Louis between the 1880s and 1940s. Anyone familiar with shotguns should be able to determine the gauge by looking at the gun, but to find the proper ammunition you should also have a gunsmith measure the length of the chamber.
Adco has no connection to your shotgun. They import semi-automatic shotguns made in Turkey. Diamond Arms Co was a trade name used by Shapleigh Hardware of St Louis, MO, on shotguns imported from Belgium c. 1880-WWI or made by Stevens and Iver Johnson from about 1900-1940. A single shot with serial numbers is most likely an Iver Johnson Champion.
remove barrel and serial # will be stamped on top of receiver on left
"What is the value of a Diamond Arms 12 Guage single shot dated 1893 made in St Louis Mo?"
$25.00 to $75.00
Can't be answered without the serial number.
I have been looking for a 12 gauge Witte shotgun. Not sure what they are worth. Do you have one for sale?
Louis Diamond was born in 1902.
Louis Diamond died in 1999.
Browning.com has a sn function under customer service.
Need serial number to date any Browning firearm.
Diamond Arms was a trade name used on guns distributed by Shapleigh Hardware of St Louis Missouri. Vorisek's "Shotgun Markings" identifies 7 different makers, but a few can be eliminated as they furnished Shapleigh with only double barreled guns. If the gun is marked only "Diamond Arms Co" it could have been made by Harrington & Richardson (1872-1985), Hopkins & Allen (1898-1915), or J Stevens Arms (1920-1942). The "E" on the serial number indicate H&R manufacture in 1944, but I would not expect the "N" following it.