25c Trans-Pacific, Air Post (C20). Mint N.H. with top plate no. 21475 selvage, mathematically perfect centering with Jumbo margins, brilliant color, Extremely Fine Gem, a truly exceptional example of this issue which is without peer, with 2020 P.S.E. certificate (Gem 100 Jumbo; unpriced in SMQ above the grade of 100, SMQ $500.00 as 100), this is the highest grade possible on the grading chart, while 23 examples of C20 have been graded Gem 100 by P.S.E., this is the first and only example to achieve the Gem 100 Jumbo grade -- with the plate number selvage as a bonus

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