If the shotgun has been modified in any way (example: sawed off barrel) the gun cannot be sold because it is illegal.
18 and 26If the barrel is less than 18 inches long or the overall gun is less than 26 inches, this gun is worth 10 years in a federal correctional facility."... modified in any way... "?
Where the notion that "modifying" a weapon renders it "illegal" would come from I have no clue since the modification of firearms of all types supports a multi-billion dollar industry. As long as the modifications do not result in a violation of state or federal firearms laws, I can do anything I bloody well please. It is a common bit of ignorance that a "sawed off" barrel on a shotgun renders it illegal. As long as the final result is a shotgun with a minimum overall length of 26" with at least 18" of barrel, it is perfectly legal. However, registration with the BATF ($200 fee) as a "Short Barreled Shotgun" allows one to create a shotgun with virtually any dimensions. Registration MUST be done PRIOR to shortening the gun. Google "short barreled shotgun" or just "SBS" and read about it.
If your gun is not of legal dimensions, dispose of it as discretely and quickly as possible -- the Feds take these violations VERY SERIOUSLY and you don't want to do time.
As to your original question ...
I believe the Crescent Gun Co. which made them closed it's doors in 1931. Knickerbockers are common and while a decent gun, were never anything special. I recently bought a decent, all original specimen in 20 ga. at a local Cabela's for $99.95.
As long as the modifications to your gun are neatly and legally done, the gun is worth what someone is willing to pay.
no it has a 4 digit serial # Knickerbocker came from 2 different companies. The American Gun Company, New York, stamped a five digit serial number on the barrel, forestock and stock end.
Check the barrel and receiver
You may have to break the shotgun down in to the barrel section and the receiver section first.Look under the barrel section on the flat just ahead of the lug for the serial number.
There should be a stamped model number on the left side of your barrel. The serial number will be on the reciever; however, the model number is on the barrel.
Try the receiver, barrel, forend
Check the receiver and barrel
look on the breach, barrel.
With the serial number that you provided,your Ithaca double barrel shotgun with the damascus barrels was produced in the year 1900.
next to the barrel
Check the frame and barrel
Look on the receiver and barrel.
not sure