#thunder electronics

Royal - RF-1 - FUZZ - FUZZ BOX

"... I believe them to be from the late 60s through the early 70s. They were made by a company called "Thunder Electronics" out of Japan. The most common variant is the Royal branded version like you have here, but there is a Thunder Electronics version and a super rare Aria version as well. ... Much of the value in yours lies in having the original box (which as you see uses the same label they had made for their Fuzz Wah pedal) (Ed Skymall)