Differences between JEM, PGM and JPM
I might be wrong but......
When the PGM 100 came out it was basically a RG770 with the F-holes and Paf pros
The difference to the Jem were... no angled jack, no tone control, no scratchplate, different neck profile, bound neck, no lions claw or monkey grip.
Same woods, same hardware, same pups and switching
Then when the PGM300 came out it had the AANJ first. Maple fretboard
The PGM500 was the first 'production' model the rest were suposedly limited eddition models (Or so I heard) this had and has been the only PGM with an angled jack. Also a pickup change it went with Dimarzio humbucker from hell and a tone zone along with a Jem single coil
The PGM800 was the Ash one with the red F holes which only now am I starting to like. now two tone zones
PGM 900 Talman body (Great neck) good ibanez pickups horrible headstock and only 22 frets
PGM90th maple on a basswood body ebony fretboard
The JPM's to me are only a new paint job although the 90th is REAL nice. The PGM''s and Jems have had multiple changes but they have been around longer.