world's oldest postcard
... that the world's oldest postcard , mailed in 1840, was designed as a practical joke to mock postal clerks?
... that the <b id="mwAWU"><a href="./Penny_Penates" id="mwAWY" rel="mw:WikiLink" title="Penny Penates">world's oldest postcard</a></b> <i id="mwAWc">(pictured)</i>, mailed in 1840, was designed as a practical joke to mock postal clerks?