California Penny Post Co., San Francisco, 7c Black on 3c Red on Buff Entire (34LU11B). Instructions for mailing and list of towns on back, bold "San Francisco Cal. 2 Oct." (1855) circular datestamp, to local San Francisco street address, light cover creases, otherwise Very Fine and extremely rare, the 7c plus 3c rated entires were intended to prepay Penny Post Co. service to the mails in one city (2c), regular government mail service between cities (3c U.S. stamp) and delivery by the Penny Post in the destination city (5c) -- in this case, the San Francisco postmark indicates that something unusual occured, but the absence of any evidence of origin leaves us grasping for an answer

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