1912 Post by Post
a mail-in coupon offer for free sample of Postum cereal-based beverage in various U.S. farm journals. "Free to you," read the ad. "For a 2c [sic] stamp (for postage) with attached Coupon we will send to any reader of this paper a trial tin (enough for 5 cups) of Instant Postum."
1933 Clip and Sip
Kool Aid (then owned by Perkins Products Co.) runs a colorful ad in Ladies Home Journal magazine, which includes a coupon for a free 5-cent package of