prior to 1968 the 94c was not stamped with a SN
I posted a link in the related links section that may be of some help.
Mine is stamped on the underside of the reciever. Take off the fore end and it should be easy to find....
It depends on who built the gun. If it was by Lindner it could be woth alot more than some other makers. Does the gun have Diamond Quaility Damascus engraved on the rib,does the gun have crossed pistols stamped on the bottom of barrels with maybe HAL under them. Do the barrels have a number stamped by the forarm lug under the barrels about one hundred higher than the serial number. If so and the gun is in exclent shape it may be worth many thousands of dollars
describe the type of shotgun and recheck the serial number
Check out the German Gun collectors web site. Your gun was built by Schilling in Shul which is Germany
Folsom was a brand name used by the Cresent firearms company,which was in business from 1888-1932.If your shotgun has Damascus barrels then it was made from 1888-1900.If it shoots standard smokeless powder shells,then it was made from 1901-1932.
Hopkins & Allen
What is the number 823 stamped on a ring mean