It's an early Phase, or Leslie speaker attempt. Very sparse inside, Big box might have attracted keyboard players more than a "stompbox" (Which it isn't) . I have one in the loft, which I assume to be later(all black with white lettering and decal). There appear to be a few or so still in existence, but I've never come across one like mine. Can't even remember how I got it , when I was a kid. Dave Simms in Ealing might have chucked it out !!!
I know i've shut the gate well after the horse has bolted, but I hope this may help.
Might inspire me to upload a photo. All I remember is that I may have lost the original panel screws..
