595, 1923 2c Carmine, top sheet margin single, NH, fresh and Fine, photocopy of 1993 PF certificate for the block from which this single originated (Scott $450).
604, 1923 1c Green coil, a common stamp in far but common condition being perfectly centered and with rich color, NH, 2019 PSE graded Gem 100 certificate, this being one of only two stamps at this lofty grade and none higher (SMQ $550)
623, 1925 17c Black, as nice as they come, pristine o.g., NH, 2019 PSE graded Gem 100J certificate - the only recorded single with this ultimate grade (SMQ $450 for grade 100).
630, 1926 White Plains Sheet, #18770 UL, just tied on registered special delivery cover to Los Angeles by multiple strikes of blurry NYPhilatelic Exhibition Station Oct 1926 cancels, backstamped New York Int'l Philatelic Exhibition Sta/ Registered (2 strikes) and 10-23 1926 registry double oval, Los Angeles Oct 26 arrival, Fine use (Scott $450 for used; unpriced on cover)
634A, 1928 2c Carmine, Type II, left margin single, exceptionally fresh and well centered, very lightly hinged, choice Very Fine;PF certificate #359209 (does not accompany) (Scott $300).