Lot
1539 
1923, 20¢ Golden Gate, tied by neat "San Francisco, Calif., May 1, 1923" First Day of Issue slogan machine postmark on E. Seebohm stamp dealer corner card label cover addressed to Karl Koslowski in Detroit, Mich.; few cover tone spots, otherwise Very Fine, a rare San Francisco first day usage. Scott Nos. 567 $2,000.
Karl Koslowski, the recipient of this cover, was the one who discovered the rare 1908 4¢ issue with Schermack type III perfs.
Realized: $400