Factory Mismatch means that a 3-screw only game somehow ended up in a 5-screw case. I think of two ways this can happen.
1. A game like Super C came out as a normal 3-screw, something was wrong with the game, maybe cracked case, crappy label, ect. The person who bought the game sent it into Nintendo. Nintendo fixed the problem, put it in a 5-screw case they had laying around and sent it back to the customer.
2. The factory that makes Nintendo games found a box or a handful of unused 5 screw carts later during the NES life cycle and ran that box threw the factory. Thus a handful of odd ball 5 screw games get out to the public.
Note that some games, like Mike Tysons Punch Out Mega Man came out in late 1987 right around the time Nintendo was switching over to 3-screw only carts. Those rare games exist most likely because they were the last in the run of 5-screws... like the last box or last week of 5 screw production.
I could be wrong, but I say this is somewhat accurate.
Edited: 08/12/2011
at 03:12 PM
by NintendoTwizer
