Six, I have one of these critters and it is one of my favorite rifles. I got mine years ago from a pawn shop in Ft. Payne, AL, and paid $88 for it. It is very accurate and a pure joy to use. I had to drill and tap the bbl for a Weaver base like your boy cause the dovetail mounts kept slipping under the recoil.
For some time now I have been looking for another M219 to rechamber to Ackley Improved. I ain't gonna touch the one I have. The internet auction spots have them occasionally and they generally go for around $200 +/- in good condition. A M219 with rifle and shotgun bbls will go highter.
To me, the M219 is head and shoulders over the NEF because of its balance, slimness, lack of an exposed hammer, and overall 'carryability'. It isn't chambered for high pressure rounds, but that doesn't bother me. I'd love to get my hands on one in near 100% condition like the one you're looking at. To me, it would easily be worth $200!
Hook