Lot no. 1751

GERMAN POST: 1899, postcard of the German post in China 10 pf. written in Chefoo with clear boxed "I.P.O." on the printed stamp with adjacent "CHEFOO 31 OCT (99)" via Shanghai where the card was cancelled by the German PO "SHANGHAI DEUTSCHE POST 6/11 99", to Germany with arrival mark on front; I.P.O.-markings on German stamps are very rare, on postal stationery item possibly unique