How many different variations of the NES version of Legend of Zelda are there?

[BlastProcessing402]

I know of the following

5-screw, gold, round Nintendo seal, no "hold reset when turning off the power" warning

3-screw, gold, round Nintendo seal

3-screw, gold, oval Nintendo seal

3-screw, gray, oval Nintendo seal

Mainly what I'm not sure of is if there are gold 5-screws WITH the "hold reset" warning, or if there are gold 3-screws WITHOUT the "hold reset" warning, or both, or neither, or any other sort of interesting variations (oval seal 5-screws or something nutty like that).

I'm not really trying to collect them or anything, I'm just curious. I've got the 5-screw, that's enough for me.

I'm also only really talking about US releases. I know there are probably Canadian ones and stuff that have differences (actually saw a Zelda 2 with a Mattel logo at a rental store way back in 88 or 89, blew my mind) but I'm not really looking for that sort of variation.

[skaar]

Purple Ganon time!

[MachineGex]

Purple Ganon time!

I woke up this morning with a "Purple Gannon"........................................... ........so yeah......

[Kiddo]

Out of that list, one I'm pretty certain you're missing is the solid yellow cartridge, which IIRC is the rarest (Well, barring the prototype FDS Disc or Charumera Ramen ban, but this only specified NES versions).

[SparTonberry]

Right, I almost forgot about that. It was only made for use by Nintendo Repair Centers.

[BlastProcessing402]

Solid yellow Zeldas? Sounds like a band name!

Anyway, does anyone know about when the "hold reset" transition happened? Before, during, or after the 5 to 3 screw change?