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Some Enders Royal Service shotguns are Crescent Model 60's marked with Shapleigh Hardware's trade name, but some were made by other manufacturers.
Enders Royal American was a brand name placed on shotguns manufactured by the Crescent Firearms Company for sale by catalog/hardware stores. You might check under the barrels for Belgian proofs as well. These guns were made before World War I and typically should not be used with modern ammunition.
Probably because everyone copied the list trade names on their web pages from the back of the Standard Catalog and it isn't there. The Catalog only lists 2 Enders model names, but Vorisek's Shotgun Markings - 1865-1940 lists 13, including the Royal American which was a Crescent Model 60. All were marked for Shapleigh Hardware of St Louis.
American
Before 1930. sales@countrygunsmith.net
Have it examined by a competent gunsmith
Enders Royal Service shotguns were distributed by HD Folsom to the hardware trade from c.1890-1920. They were imported from Belgium (will have proofmarks) and made domestically by at least two different manufacturers.
Lender's royal service # 117709
all you have to do is look up the answer on goggle and get the answer right away
No known published sn data
try www.e-gunparts.com or www.gunbroker.com you may have some luck there.
Ruth Enders's birth name is Ruth Beatrice Enders.