I won't confess to having thought of this idea first. There's lots of other people doing this. Indeed the shop where these stamps were made mark their own brown paper bags with stamps too. And, my old dad had his own self-inking stamp for making business cards when he had his own company some 20 years ago. But what these stamps do is give me flexibility. The large stamp fits on letters and envelopes as well as being just the right size for the reverse of a business card. Or calling card, as I prefer. The smaller stamp fits both letters and also the front side of a calling card.