cover 3c Dull Red (11), clear to large margins, small faults, tied by blue "Paid" h.s. on 1851 blue folded letter to Wilmington, Del., letter headed "Summit Pass Camp, Tuolumne Co.", clear blue "Sonora, California/Dec. 10, 1851" two-line straight line pmk., minor very skillful cover mend at bottom, otherwise very fine, a rare California straight line pmk. on an attractive cover, illustrated in Letters of Gold by Coburn, p.308 photo