My first post here, as I am picking up a '99 RG7621 later today. My first journey into the world of 7-strings :-) (But my 3rd RG...)
The last couple of days (while searching the net) I've noticed a lot of people having a hard time distinguishing the 7621 from the 7421 and vice versa. I've seen ads claiming this/that model, which actually is the opposite. (Well if you thought you were buying a 7421 and got a 7621, good for you! But the other way around is probably not a pleasant surprise...)
This excellent site share some information, but really not enough to spot the difference (at least not for me):
It doesn’t really help that most models are black and was produced in overlapping years either :-) (You could of course remove the neck and check the printing in the neck pocket, but by then you probably have bought it anyway).
BTW: I'm not including the 7321, as this is a Korean model and will easily be recognized by its serial number - letter and first two numbers (production year).
There is (as far as I know) three main things you could look for distinguishing a 7621/7421 in pictures:
1. The 7621 has triangle looking routs/cavities to fit the "ears" from the pickups. The 7421 have a bit larger rectangle ones.
2. Pick-ups. The two humbucker models have some visual difference, in that the 7621 has hex poles on both coils, while the 7421 has one coil with fixed poles
3. Tail bridge: The 7621 has flush surface (the hex adjusters is not raised from the block) and rectangle holes for the strings to pass through. The 7421 has a raised area in the front where the adjusters are, and a teardrop shape for the strings.
Here are some good links to see what I mean:
7621 - http://www.ibanezregister.com/Gallery/RG/gal-rg7621.htm
7421 - http://www.folkofthewood.com/page2556.htm
Well, hope that clears up some confusion and debate. And sorry if this is "old" news and should have been put elsewhere.
Be gentle, I'm a newbie here. And being Norwegian, my technical English could probably be better :-)