Serial numbers on the back of the headstock are II00697 which indicate that it was made in Korea in 1991. Recently I have been doing some research as I want to know more about it & the precise output of the P-90's that are in my guitar.
When my luthier installed Grovers he was really taken w/ the guitar & later told me it was a Japanese model from the late 70's early 80's which I think would make it a Matsmoku. I bought the Casino in Toronto when at the time I was told it was 'new' but that it was Japanese. I'm considering getting the wiring upgraded in due course but that's another story. The only thing I've ever changed on it from stock are the tuners which I upgraded to Grovers. I've owned my Epiphone Casino since 1995.
Great to find a forum for my favourite guitars - Epiphones!