This is a Thorcraft Cobra 20 watt amp made in 1968 in Vancouver, BC, Canada. Made by a Dan Thorklesson who setup the Thorcraft company in Vancouver in the early/mid 60's. He made a number of amps, some under the more common Garnet name, with the Thorcraft amps serving as higher end models. Most everything seems to have stopped sometime around 1970.
Sound wise, this amp is unique. Overall, it does not do glassy cleans. Anywhere above 2 on the volume dials and it starts to break up; by the time it's at 10 you get some heavy growl.