(French Post Offices) 1881 (1 Juil) envelope to Mainz franked Sage 2c., 4c. and two 15c. tied by ‘5104’ large figures lozenge with Shang-Hai Chine cds in association, arrival backstamp. The 2c. is unrecorded with with the gross chiffres ‘5104’ cancel, believed to be a unique franking.
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