Lot
2820 
Envelope, 1952, 6¢ on 5¢ carmine, double surcharge, one inverted, clean mint example of this very rare entire, Extremely Fine, of the approximately 83 issued, we can only imagine that a tiny number still exists with this elusive surcharge error, the only other example ever offered is the ex-Lilly and Floyd copy; unlisted in both Scott and UPSS; with 2007 P.F. certificate. Scott No. UC23 var. $2,000 for normal entire.
Realized: $1,050