With the BLUE control panel, it's between 1966 - 1974. Sorry I don't know when the "-07" models were around, but I'm sure someone will jump in and nail it!
...The Kitty Forman special! I don't know if it's the exact model washing machine seen on That '70s Show (I've never seen a photo with enough detail to make that call), but it's the same generation as Kitty's 'Tags - and of course, that same avocado colour.
Just found a closer pic, and this is not the same generation as Kitty's 'Tags - her machines' control panels had the Sungold trim instead of the blue, making them later '70s:
I have a bunch of both NOS and excellent used console parts (buttons, switches, ect) for your 608. I even have an entire 606 console with everything except a cut wiring harness (send all hate mail to RCD for that one, lol), if you want it. You can have it/them for free! Email me!