Printed "Congressional Frank" of Thomas S. Butler, MC (PA) with Washington, DC, machine cancel (October 18, 1921)
<small><i>The Cooper Collection of U.S. Postal History</i></small>
<a href="//commons.wikimedia.org/wiki/User:Centpacrr" title="User:Centpacrr">User:Centpacrr</a>
<a href="https://en.wikipedia.org/wiki/en:File:Congressional_Frank_1921_T.S._Butler.jpg" class="extiw" title="w:en:File:Congressional Frank 1921 T.S. Butler.jpg">en.wikipedia.org</a>