This is a picture of an 1851 British Guiana 2 c pink cottonreel on cover.  Once owned by Phillip Ferrary, it was acquired by King George V for the British royal collection.
<p>British Guiana government<br></p>
(Life time: not applicable)
1851-03-01
<p><b>Original publication</b>: 1851<br></p>
<b>Immediate source</b>: <a rel="nofollow" class="external free" href="http://baudotcapital.com/baudot_markets_rarestamps_targetmarkets.php">http://baudotcapital.com/baudot_markets_rarestamps_targetmarkets.php</a>