Strange, I got 2 Kodakchrome 64 from 1982 just taken and mailed Kodak Denmark about how to procces them.
The answer was that if they are the "new" kind form midt 1970 I could just sendt them to Lausanne in the bags that came with them.
That's what I did with some 1986 Kodachrome last year.
"People who say things won't work are a dime a dozen. People who figure out how to make things work are worth a fortune" - Dave Rat.