This is an excellent sounding Twin Reverb, with FEIC front and back panels indicating Pre-CBS. The tube chart is labeled April of 1965, so it's hard to say if it was truly built before the CBS transition. Condition wise it shows moderate signs of previous wear, with some tears in the tolex on the top corner, and near the bottom of the amp - although structurally, it's in good shape. The baffle board has been changed, and now sports a pair of 50w Naylor Special Design speakers, which do great justice to the sound quality.
Internally, it's had the power cord and electrolytic caps changed, along with some power resistors. One plate resistor has been changed, along with the Phase Inverter coupling caps. Otherwise all of the rest of the preamp parts are original, including the rest of the "Blue Molded" Ajax coupling caps. See circuit photos for further details.