What is 'Circle xxxx on Inquiry Card'?

bristlehog wrote:

What is 'Circle xxxx on Inquiry Card'?

BYTE Magazine (or any magazine for that matter) would have a perforated "inquiry card". It would have a mail-back address and sometimes already a special kind of postage ("No postage if mailed anywhere within the United States") on the front side of the card. On the back side would be a list of numbers. It was only for advertisers and such found in the magazine. A reader would circle (with a pen) the number(s) on the back of the card of what interested them. The reader would then mail it back to the magazine. I'm not sure exactly what would happen next since I never did this, but in theory from *somewhere* (from the advertiser direct, probably) even more marketing information for the company or product would be sent through the mail to the reader directly, or perhaps the advertiser might otherwise contact them.

Something like that, at least. 😉