San Francisco County Postmark Collection. Over 350 covers and cards; most 20th century to modern, some better early postmarks, including 1899-1910 Presidio, San Francisco postmarks with 1851 integral "10" rate, 1860-70's usages on with comprehensive 1880-1950's including slogan, stations, auxiliary, section of first flights and modern commemorative; clear readable town strikes (no photo). Estimate  $400 - 600. $0