The RG321MH features ahard-tailbridge and a mahogany body instead of the basswood body which is more standard for RG models.
The RG321MH has been available in various finishes, including a standard black and oiled finish. In 2006, two limited edition finishes were released for the Japanese market, the so-called "multi-layer" models. In 2008, a limited edition Weathered White version came out for the European market. In 2010, the RG321MH was updated with aGibraltar Standardbridge. For 2011, a new Blackberry Sunburst finish was added to the lineup and the Wizard II neck was renamed Wizard III.
The RG321MH was discontinued after 2012 and replaced by the very similarRG421.
