The Yamaha G-100-212 guitar amplifier is known for its clean tone, [nice] distortion and it get’s loud. Looks like a Fender Twin and
was made from 1978-1982. It is solid state and rated at 100 watts containing two 12″ Yamaha speakers. These do appear on eBay in the range of $150 to $225.
Archived past online sales data: