Some call them Fender killers - vintage Gibson's are known to fly under the radar, while having similar topology to many coveted amplifiers from the tonally famed era. The Gibson GA30RVT has some very interesting features, in a slightly larger physical form factor to a Fender Twin. 

Typical Gibson cabinet construction, it has a nice look with a grey tolex, and a reddish grill cloth - seen here in good condition with some typical wear. Four inputs, this has a nice earlier compression with a kind of tone similar to a Deluxe or a Pro. This unique baffle designed with a 10" and 12" speaker, it would make a great studio tool for easily achieving two different tones. These speakers are not original and have been replaced with appropriate more modern Jensen equivalents. While this amp has two separate channels, it appears only the second channel (Reverb and Tremolo side) is functioning. That said, the Reverb currently non-functioning - potentially a simple fix for some, or possibly not "too big of a deal" for anyone using a modern reverb pedal. It retains the original footswitch. 

One might consider fixing this up or bringing it to an experienced tech for the service.