The only way that this Colt is "very highly collectable" is if it's a green label, push-pin front pivot, mag fence, bayo lug, 1 in 7" chrome-lined, and has standard sized trigger and hammer pins. These DO exist and they are the really collectable ones. They also have "Government Carbine" on the label.
Otherwise...they are relatively easy to come across. With that in mind, I'd spend the money on it accordingly.