The Start of the Divided-Back Postcard in the U.S.
"Here's wishing us more friends and less need of them." Copyright 1906 by H.H. Tammen of Denver. An old comic postcard. On the back is a bit of history:
Right below "This Side Is Exclusively For The Address" is a thin line dividing the back, and a note that "After March 1, 1907, This Space Can Be Used For A Written Message."
What happened if you wrote on the left side before March 1, 1907? Would the mailman refuse to deliver your card? There was never a space for a return address, so no one could trace the infraction back to you, if you slipped it in a mailbox somewhere...
Thanks to Beth at The Best Hearts Are Crunchy for hosting this online gathering. Be sure to check her blog for some fantastic vintage postcards, and links to many more.