Here's a demo of two mid-60s Harmony products. The guitar started life as a standard red H77, but it was refinished in this lovely green burst and a Bigsby was added, essentially turning it into an H78, like Dan Auerbach's main guitar in The Black Keys.
The amp is an H400. It was manufactured in Chicago by Sound Projects (Lectrolab). It's a simple amp with AC filaments, 3 tubes, and just one volume knob. The tone, I think you'll agree, is quite excellent, and perfect for recording. It has the original Rola 8" speaker.