There are distinct runs of these the first in 1986 and 1987 comprising domestic made in Japan models The 520J, The 520P and the 520R. The second in western catalogues the 520FZ and the 520 DZ from 2005 to 2007. There is also an FZR which I don't have full information on.
| Model | 520J | 520P | 520R |
| Produced | 1987-91 | 1986-87 | 1987 only |
| Body | Basswood | Basswood | Basswood |
| Neck | Bolt on Maple | Bolt on Mahogany painted black | Bolt on Maple |
| Fretboard | Rosewood 628mm scale 350mm radius 22 frets dot markers | Rosewood 628mm scale 350mm radius 22 frets dot markers | Rosewood 628mm scale 350mm radius 22 frets dot markers |
| Bridge | RMX III | RM II | RM II |
| Pickups | 2 Yamaha Select EMG HBs | 2 YGH-F1BO HBs | 2 YGH-F1BO HBs |
| Pickguard | Black | Black | Black |
| Hardware | Black | Black | Black |
| Tuners | Black Diecast | Black Diecast | Black Diecast |
| Controls | Black 1 Volume 1 Tone 3 way switch coil tap | Black 1 Volume 1 Tone 3 way switch no coil tap | Black 1 Volume 1 Tone 3 way switch coil tap |
| Colours | Black, White or Sparkling Red | Black, White or Fine Red | Black, White or Sparkling Red |
These appear in the Western Catalogues from 2005 to 2007. I don't have access to any Japanese catalogues after 2001 so I can't say whether or not they were available to the domestic market. They are both made in Taiwan or Indonesia. What I know about the FZR is that it appears by serial numbers to be made in Indonesia around 2015 but I can't find it in any catalogues.
| Model | 520DZ | 520FZ | 520FZR |
| Produced | 2005-2007 | 2005-2007 | Not Known |
| Body | Alder | Mahogany with FMT | Mahogany with FMT |
| Neck | Bolt on Maple | Set Mahogany Matching Body | Set Mahogany Matching Body |
| Fretboard | Rosewood 648mm scale 350mm radius 24 frets No markers on front | Rosewood 648mm scale 350mm radius 22 frets Custom inlay no dot markers | Rosewood 648mm scale 350mm radius 22 frets Custom Inlay no dot markers |
| Bridge | Fingerclamp locking system | Yamaha AES | Yamaha AES |
| Pickups | 2 Ceramic HBs | 2 Alnico HBs | 2 Unknown HBs |
| Pickguard | None | None | None |
| Hardware | Chrome | Chrome | Chrome |
| Tuners | Various Colours Grover Cylindrical Recessed | Various Colours Grover Cylindrical Recessed | Chrome Diecast |
| Controls | Chrome 1 Volume 1 Tone 3 way switch no coil tap | Chrome 1 Volume 1 Tone 3 way switch no coil tap | Chrome1 Volume 1 Tone 3 way switch no coil tap |
| Colours | Black, Flat Silver or Shelby Blue | Trans Black or Trans Dark Red and others not catalogued | Only ever seen Trans Red |
There are 2 (or 4) models there is the 521 with a Maple Neck Version and a 521D also with a Maple Neck Version.
The 521 is in the western catalogues in the early 90s and the D appears in the Japanese catalogues in the mid to late 90s.
The 521D
This along with the DM appears to have been for the domestic market but was made in Taiwan.
Specifications
Body Alder
Neck Bolt on Maple
Fretboard Rosewood or Maple 648mm scale 350mm radius 24 Frets Dot Markers 2 at 12th and 24th Fret
Headstock see pictures
Tuners Black Diecast
Pickups 2 Focus SH2 Ceramic Humbuckers and 1 GS F1B SC
Controls 1 Volume 1 Tone 5 way switch inc coil tap
Nut Black locking
Hardware Black
Bridge TRS 505
Pickguard None
Colours Black, Violet Burst or Trans Red Sunburst I have also seen a Yellow/Natural not catalogued
Years Produced 1995-2000
This along with the 521M appears to be for the export market and is Made in Taiwan.
Specifications
Body Alder
Neck Bolt on Maple
Fretboard Rosewood or Maple 648mm scale 350mm radius 24 Jumbo Frets Dot Markers 2 at 12th and 24th frets
Headstock Black see picture for details
Tuners Black Diecast
Pickups HSH unspecified pickups
Controls 1 Volume 1 Tone 5 way switch with coil tap
Nut Black locking
Hardware Black
Bridge TRS 101
Pickguard None
Colours Metallic Black, Pearl White, Crimson Red, Blue Pearl or Yellow Pearl
Years Produced 1991-1995
