Bottle date help needed

Hello,
I recently picked up a two bottles of scotch at a yard sale claimed to be 30 plus years old. I was a bit skeptical but for $20 bucks each I was willing to take the change.

Johnnie Walker Red Label
Label code - L8GA6700879

Dewars White Label
Label code - LLSC1209935

Any help is appreciated.

Thanks,

Matt