The RG7421 is a similar model with a fixed bridge. The RG7420L is a left-handed version.
The original RG7420 had a production run of three years, but in 2013 model year, an updated model was reintroduced with the same model number.
The RG7420 is occasionally mistaken for the RG7620. Ibanez sometimes used necks interchangeably between the two models, so some RG7420 necks will be stamped "RG7620". The most reliable way to distinguish between the two models is to look at the tremolo — the 7420 uses the Lo-TRS 7 tremolo while the 7620 employs a Lo Pro Edge 7.
Specifications for RG7420 (2000–2002)
Model name: RG7420 / RG7-420
Year(s) produced: 2000–2002
Sold in: Worldwide
Made in: Japan
Finish(es): Black Pearl (BP) / Cosmic Blue (CB) 2001 / Magenta Crush (MC) / Northern Blue (NB) / Royal Blue Flat (RBF) 2001–2002