Long time, No post. Just looking at my NES game recently and found this. Guess I didn't look too closely at my Gyromite 3-Screws but one has "Made in Japan" and one does not. The "Made in Japan" is also has a Rev-A backing.
I have a few variants. I'll post pictures sometime but I have:
5 screw Defenders of the Crown
5 screw Tiny Toons
5 screw Metal Gear
5 screw Snake's Revenge
5 screw Skate or Die
5 screw Super C
3 screw Gyromite x2
5 screw Star Force
5 screw Jaws
5 screw Alpha Mission
3 screw Donkey Kong
N7 Tecmo Basketball x2
Think that's everything but I'll post updated pictures soon.