1854 (Mar. 24, Apr. 17) to Washington, D.C. via Boston "Ship", correspondence pair of blue folded covers with Boston Mass. "Ship" and "Free" rating handstamps addressed to the Auditor of the Treasury, Mar. 24th with black "Ship" and Apr. 17th with red "Ship", later undated; Extremely Fine and rare exhibition pair. Estimate  $300 - 400. $0 (Image)