VERY FINE. AN EXTREMELY RARE PLATE BLOCK OF THE IMPERFORATE 3-CENT 1861 ISSUE.
The imperforate 3c 1861's on stamp paper are normally encountered without gum, though some original-gum examples do survive. Pairs are readily available and we have offered a handful of blocks of four. However, plate blocks are extremely rare. A Power Search review failed to find another plate block of this issue in our sales since 1994.
Inadvertently omitted from 2012-14 Scott Specialized Catalogs. 2011 Scott Retail as four pairs of No. 65Pc (imperforate on stamp paper)