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<p>[QUOTE=&quot;yakpoo, post: 5386440, member: 18157&quot;]I found this...</p><p><br /></p><p>&quot;An interesting variety to look for within the 1952 Proof Set is the so-called “Superbird” Washington Quarter. On the reverse some quarters, a distinctive “S” appears in the center of the bird’s chest, reminiscent of Superman’s costume. It is suspected that a mint employee added the “S” intentionally to a single reverse die. This suggests that perhaps 15,000 to 20,000 examples of the variety may have been created, with an even smaller number of survivors.&quot;</p><p><br /></p><p><a href="https://proofsetguide.com/1952-proof-set/" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://proofsetguide.com/1952-proof-set/" rel="nofollow">https://proofsetguide.com/1952-proof-set/</a></p><p><br /></p><p>This seems to suggest that a single reverse proof die was used to strike &quot;15,000 - 20,000&quot; coins...in 1952. Does anyone know if that makes sense?[/QUOTE]</p><p><br /></p>

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