1975, 1976 or 1977
The first year for the gold control panel trim was 1975 and I believe the last year for avocado was 1977, so they would be one of those 3 years.
Kevin
PS... Phil, you can easily tell the "806" control panel by the vertical chrome strip that goes up from the timer surround, dividing the control panel in half. Also, look at the white panels, if they are rather "white" and look some what "flat" or like a matte / non-reflective finish, they are not 806's. However if they look like a more "dull" or dingy white or perhaps "bluish white" AND if you can see any reflection in them, they're glass and defineately 806's / 808's. I hope this helps!