Sonoma County Postmark Collection. Approximately 150 covers and cards; virtually all 20th century to modern with few 19th century including 1886 Clairville and Wells, Fargo & Co. Petaluma 3¢ star die paste-up usage, early 20th century including Portola Festival label usage (El Verano receiver), Guerneville, some 1st flights. Estimate  $300 - 400. $0 (Image)