I would think that this would be a fair price provided it truely is marked as a Colt. To the best of my knowledge Colt never actually went forward with the venture with CZ, so this pistol may be a pre-production prototype.
Now CZ has had such high regard for the pistol that was developed for the joing venture, they are producing and marketing it on their own as a CZ. These pistols are marked CZ40 and only have CZ markings. So take a good look at it and determine if it really is marked Colt. I have not seen a CZ 40 yet so I can not tell you what the market price for this pistol is as a CZ.
I hope this helps.
The best handgun for self defense, is the one you have with you.