I love old coupons. They are a great documentation of old packaging design, pricing trends, and even design and illustration trends of the time. Sometimes they're matter-of-fact, sometimes they're colorful and eye-catching, and sometimes they're made to look really official, like certificates, and even money! You'll notice the coupons below are so retro (going back to the 1960s) they don't have barcodes. A few even use the old IBM punch card system for processing!
Want to see hundreds more? Check out the Flickr group called "Clip and Save" here.