Bamber & Co.'s Contra Costa Express, bold oval handstamp on 1861, 3¢ pink entire to San Francisco with "Answer By Bamber & Co.'s Express…" boxed handstamp, small pencil initial at top right corner thought to be the Wells, Fargo & Co. agent's, Very Fine. Estimate  $100 - 150. $0 (Image)

Bamber & Co.'s Contra Costa Express, fancy scroll frank on 3¢ pink entire to San Francisco with printed corner card of the "American House/Centreville/Alameda County, Cal." at lower left, endorsed "Enclosed Coin $5/Collect", small cover tears at top, F.-V.F. and attractive. Estimate  $150 - 200. $0 (Image)

Bamber & Co.'s Contra Costa Express, Paid, bold oval handstamp on 3¢ Nesbitt entire to San Francisco, with boxed "Answer By Bamber & Cos. Express…" directive ad handstamp; missing backflap, Extremely Fine strikes. Estimate  $100 - 150. $0 (Image)

Bamber & Co.'s, Contra Costa Express, Paid, bold oval handstamp frank on 1853, 3¢ Nesbitt entire to San Francisco, with matching "Answer By Bamber & Cos. Express…" with pointing hand directive box handstamp, original 1860 enclosure headed "Pacheco", Very Fine. Estimate  $150 - 200. $0 (Image)

Bamber & Co.'s, Contra Costa Express, Paid, oval handstamp on 1853, 3¢ Nesbitt entire to San Francisco, with "Answer By…" company advert boxed handstamp; cover edge wear at upper left, F.-V.F. Estimate  $100 - 150. $0 (Image)