I seem to recall having seen it in either Newsweek or US News & World Reports at the optometrist's back in 1990 or thereabouts.
Thinking back to the misty past, the only thing Commodore Australia tended to advertise in was local Amiga magazines. Sure, you want your existing customer base to upgrade/expand their systems but you are not really going to increase the existing user base all that much unless you go out and get new blood from new areas.