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US Civil War postal cover Cincinnati Ohio - Philadelphia and has Scott US stamp #65.
Has a full US postal cancel stamp Cincinnati O Dec 13 - Address to Mrs Paxton No 4 West Penn Square below market Philadelphia - envelope is empty and backside is blank but still have the red wax seal 
 
Original
Date: mid c1860s
Measurements:3 x 5.25 inch
Condition: ​Sold as used item, edge/surface wear, no major creases , no tears