I have seen one of the ads done in print before:
It showed the same old couple sitting next to their 50s RCA roundie, and how they were upgrading to an xl-100, or some such thing.
edit: an internet search turned it up, clearly my poor memory was influenced by the commercial, but the idea is the same-roundie purchased in '56 (could it be a 21ct55?).
http://senses.typepad.com/senseswork...-100-1973.html