Alright, after many years I finally bit the bullet and went after one of these full force. Auction just ended this morning and I ended up paying about $100.00 shipped for the system, power supply, AV cables, and six loose cartridge games. From the description and picture I'm going to take a stab and say the games are...
Abadox
Getsufuu Maden (or Getsu Fuma Den, or Getsu Fuu Ma Den)
Majou Densetsu II: Daimashikyou Galious
Mouryou Senki Madara
Quarth
Tetris
All appear to be authentic. The system is the black and green AN-505, which of the four Twin Famicom models is the one I've always wanted most. I'm going to assume the FDS belt is shot and will need replacement but I've fixed / maintained far more difficult things.
So I'm curious, how well / poorly did I do? After being so put off at the initial price + shipping for Twin Famicoms I stopped looking all together for awhile until last week when I came across this one. With that in mind I don't know the current going rate for these systems. I mean, either way I'm psyched about my purchase.