Airmail, Airship <i><a href="https://en.wikipedia.org/wiki/LZ_129_Hindenburg" class="extiw" title="en:LZ 129 Hindenburg">Hindenburg LZ 129</a></i>
scanned by <a href="//commons.wikimedia.org/wiki/User:NobbiP" title="User:NobbiP">NobbiP</a>
scanned by <a href="//commons.wikimedia.org/wiki/User:NobbiP" title="User:NobbiP">NobbiP</a>