<p>A WWI British recruitment poster. The Imperial War Museum <a rel="nofollow" class="external text" href="http://www.iwm.org.uk/collections/item/object/27762">identifies</a> this as Parliamentary Recruiting Committee Poster No. 108. It also points out that St. George and the Dragon served as a national symbol for several parties in the conflict (which includes Germany, ironically enough).
</p><p>Library of Congress Description:
</p>
<dl><dd><b>Title:</b> Britain needs you at once<sup><i>[sic: the LoC uses weird capitalization rules]</i></sup> / printed by Spottiswoode &amp; Co. Ltd. London E.C.</dd></dl><p><b>Date Created/Published:</b> London : Parliamentary Recruiting Committee, [1915]
</p>
<dl><dd><b>Medium:</b> 1 print (poster) : lithograph, color ; 76 x 50 cm.</dd>
<dd><b>Summary:</b> Poster showing St. George slaying the dragon; scene in roundel format.</dd>
<dd><b>Reproduction Number:</b> LC-USZC4-11248 (color film copy transparency)</dd>
<dd><b>Rights Advisory:</b> No known restrictions on publication. For information see "World War I Posters" (<a rel="nofollow" class="external free" href="http://lcweb.loc.gov/rr/print/res/243_wwipos.html">http://lcweb.loc.gov/rr/print/res/243_wwipos.html</a>)</dd>
<dd><b>Call Number:</b> POS - Gt Brit .P37, no. 4 (C size) [P&amp;P]</dd>
<dd><b>Repository:</b> Library of Congress Prints and Photographs Division Washington, D.C. 20540 USA</dd></dl>
<ul><li>Parliamentary Recruiting Committee</li>
<li>Spottiswoode and Co Ltd (printer)</li>
<li>Adam Cuerden (restoration)</li></ul>
The artist is unknown, see below.
This image  is available from the United States <a href="//commons.wikimedia.org/wiki/Library_of_Congress" title="Library of Congress">Library of Congress</a>'s <a rel="nofollow" class="external text" href="//www.loc.gov/rr/print/">Prints and Photographs division</a><br> under the digital ID <a rel="nofollow" class="external text" href="http://hdl.loc.gov/loc.pnp/cph.3g11248">cph.3g11248</a>.<br><small>This tag does not indicate the copyright status of the attached work. <span style="white-space:nowrap">A normal <a href="//commons.wikimedia.org/wiki/Special:MyLanguage/Commons:Copyright_tags" title="Special:MyLanguage/Commons:Copyright tags">copyright tag</a> is still required.</span> <span style="white-space:nowrap">See <a href="//commons.wikimedia.org/wiki/Special:MyLanguage/Commons:Licensing" title="Special:MyLanguage/Commons:Licensing">Commons:Licensing</a>.</span></small>