We had one or two Shakey's pizza locations in Winnipeg, may or may not have been the same franchise. Last one closed up around 1983 or so. I used to go for the all you can eat lunch buffet once in a while.
My friends and I used to go to the Nairn location for the all you can eat buffet. Pretty sure they lost money on us. We would spend a least 2 hrs just eating