Yeah it's a K-10... there's some dub forum on the net where you can read all about it. You're right, it was developed as some sort of reverb unit for car stereo systems back in the sixties... so if your tracks weren't verbed enough already, you could big pimp and put this thing on for your cruising enjoyment.
Listening to "I'm Your Puppet" (Bobby and James Purify) through a K-10 space-expander in a 60's Chevy in east LA... can you imagine? I wonder what it sounded like when you hit a bump in the road with your cut coils/ lowered car...
