Boxer Rebellion Cover Peking to Wien, 1901. 5 10 Pfennig

Boxer Rebellion Cover Peking to Wien, 1901. 5 10 Pfennig: "Boxer Rebellion Letter 1901: Self made cover with German 5 10 Pfennig stamps ? tied by 1901 May 5th ? cancellations. Sent to Vienna, Austria, during the Boxer upraise in Beijing. Clean and fresh cover, clear cancellation."