16c Dark Blue, 1923 Air Post (C5). Mint N.H., perfectly centered with wide margins, deep rich color and proof-like impression on bright paper, long and full perforations

EXTREMELY FINE GEM. THIS STUNNING MINT NEVER-HINGED EXAMPLE OF SCOTT C5 IS GRADED GEM 100 BY P.S.E. -- THIS IS THE HIGHEST GRADE AWARDED AND ONLY ONE OTHER HAS ACHIEVED IT.

The first two series of United States Air Post issues, Scott C1-C6, are among the most recognizable U.S. stamps. They were printed in relatively small quantities compared to later issues -- Scott C5 saw just over 5.3 million stamps issued, versus over 42 million for Scott C7. C5 is also one of the most difficult of the series to obtain in such a high grade, based on Population Report numbers.

With 2017 P.S.E. certificate (Gem 100; SMQ $3,900.00). This is the highest grade awarded and it is shared by only one other. This is the first time we have offered this grade in one of our auctions.

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