The "O I" stamp in green was used in 1966
Width at the Nut: 1 11/16"
it is a unique new design with an incredibly warm transparent tone we refer to as ‘spatial sparkle’
finish and workmanship are flawless
VALCO also made National and SUPRO brands
1993 Rivera Hundred Duo Twelve Black, Excellent Make_T-Rex The "O I" stamp inThis is the amp that make the Twin Reverb and even The Twin obsolete. The Rivera Hundred Duo Twelve is a very versatile, loud, punchy, and rich sounding amp. Channel one (distortion) has a British (Marshall) flavor, not a clone, just the flavor. Channel two (clean) has an American (Fender) flavor. This amp has a huge amount of clean headroom, and at the same time, has a full, strong bottom end. As with all Rivera's there are lots of gain arrangements