Where can you find information about a very old Remington 12 gauge automatic with the number 52707 as its only marking?
Remington did not produce any shotguns without markings. Look
carefully at the top of the barrel and both sides of the receiver.
Possibly, either wear or some dimwit with a polishing wheel has
obliterated the markings that were there, or perhaps they are so
faint they are difficult to see. If nothing else, send us a digital
picture of the gun and we can identify it for you. Probably a
version of the Model 11. email@example.com