Originally posted by: mighty one
I know Adventures in the Magical Kingdom is somewhat rare as it commands a higher price from what I can tell. In my mind that means the proto will be more valuable.
Searching "Magic Kingdom" in just titles under NES games on Ebay returns 61 results, it's not even uncommon let alone rare.
I was only using my Capcom protos to give you a reference point. Here is a list of some other protos and prices I've paid to really help you out:
Archon $77 shipped
Spy vs Spy 2: The Island Caper. Unreleased, Undumped, Only Copy Known, $300
Solomon's Key 2, Unreleased NTSC Format, $215
Caveman Ninja, Unreleased NTSC Format, $215
Tiger Heli, $75
Super Glove Ball, $86
Airball, Unreleased, this specific build currently undistributed, $300
Star Trek V, Unreleased, $300
9 Various protos, $77 a piece
Caesar's Palace proto with several KNOWN differences, $70 shipped
Hatris and Bases Loaded protos, $94 a piece
Several unreleased titles for around $300, plenty of protos under $100, even those that are clearly different than the final build. Beyond that, you have to bear in mind that I am not a casual collector and often pay a PREMIUM for these games.
I mean, I don't really know what else to tell you. You have a very nice piece and certainly something to be proud of, but it's likely (not positively, but likely) worth between $75 and $125. I have no vested interest in the game, I haven't made an offer on it, so I have no reason to downplay the value. If anything, I'd love it for sell for far more than my estimate as it would make my collection be perceived as being MORE valuable. Others can chime in with estimates, but I'm giving you examples of actual sales, not arbitrary numbers that I pulled out of nowhere.
Anyway, that's pretty much all I got. Good luck with whatever you decide to do with it.