I swear I had this model for a brief period in 1979.
I bought it as a display model at K-Mart and it turned out to have been on the shelf, presumably running mostly, for 2 years.
It conked out (color got wonky) after a month or so and the shop failed to fix it so I took it back and screamed and hollered till I got a refund. :yes:

I was never entirely happy with the picture even when it was working right.

http://cgi.ebay.com/Vintage-1977-Panasonic-color-TV-great-shape-W-manual_W0QQitemZ190352916441QQcmdZViewItemQQptZVin tage_Electronics_R2?hash=item2c51eaffd9