Gibson - Reverb Echo - GA-4RE '66 "Adineko oil can delay system by Ray Lubow inside. It's a kind of magic when you look on this system detailed and understanding it could delaying the sound. Three RCA tubes on board -- 12AU7 and 2x 6EU7."
Have a look at that snap fastener for the footswitch!
cred: facebook.com/Al Soulman