Thinking about selling a 66-1 with a six inch barrel (includes box etc) to pick up a 66 no dash snub without the box in great condition. What is the 2015 value on these bad boys. Thanks

I suspect you are going to have to add some boot on your end to get that deal done. The 6" is the least desired and the 2" is the most desirable.

Oh I know, just curious on how much this is gonna hurt my wallet if I can unload my gun for a fair price.

Don't do it. The M-66-1 has engineering changes to avoid the cylinder binding as the gun heats up from firing. (Relocation of the gas ring.)

And the six-inch shoots easier and has higher velocity and less blast.

Why would you not do what you want to do. The snubbie U.S. much more practical and useful. I have the blue snd it's one if my favorite guns. Whatever the cost go for it. I see the snubbies in great condition going from 750 all the way over 1000. Not sure about the 6 inch.
JR