Kevin,
The blue guns can usually be found selling for 450 to 500 on the internet auctions, depending on the condition, and how bad the buyer wants it. The NM barrels were 2 piece (i.e. a cone was sweat soldered over the Colt barrel, and it was shortened to Combat Master length). These barrels were not known for their longevity, so even though it's a NM, it likely won't add any value to the sale (unless you find a collector who doesn't yet have one of those in his vault, and he really wants it bad).
Hope this helps, ...Deeton