I think I have one from that ad! Bought a little while ago for something like 70x that price and consider it a great deal! Its been demilled a little more since then to keep up with ATF demil standards. Looks like back in the day they torched the chamber right were it connects to the rest of the gun. Not everyday you run into a Marlin digger (well without the digger part!). I do like it a lot but if I had a choice I would rather have it with the digger function and not an AC gun. Just a standard 1914 ground model for me.... maybe one day.I found this advertisement in the May 1936 American Rifleman for ....and Marlin aircraft machine guns for $7.75.