2c Black, F. Grill, Very Thin Paper (93 var).
Choice centering with wide margins, crisp impression, cork cancel, Extremely Fine Gem, with 2010 P.F. certificate mentioning the Thin Paper variety, with 2009 P.S.E. certificate which does not mention it (XF-Superb 95; SMQ $1,000.00 as normal)
Image Magnifier / Download
Power Search for Comparables