A forgery of the 4 annas inverted head 1854 is shown at the left.  A genuine stamp (cut to shape), although not an inverted head, is shown at the right for comparison.   Four different dies were used to print the four annas stamps.
<a href="//commons.wikimedia.org/wiki/User:Jacquesverlaeken" title="User:Jacquesverlaeken">Jacquesverlaeken</a>
2012-08-12
<span class="int-own-work" lang="en">Own work</span>