24c Interior (O22). Tied by segmented cork cancel with "San Francisco Feb 1?" circular datestamp on "Official Business., U.S. Surveyor-General's Office" imprint legal-size cover to Milton Cal, stamp with small faults and reattached with hinge, cover being tastefully restored especially along edges and backflap reattached, still Fine and presentable, this example is unrecorded in the Campbell census (Chronicle 188, November 2000) which records eight covers (one of which is cut down significantly)

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