cover 1891 (26 Nov.) envelope from Hannover to Peking, routed via Leipzig, Munich and Brindisi, bearing 20pf. tied by c.d.s. and showing fine strike of boxed "To Pay" in red applied in Shanghai Chinese Customs Post and, on reverse, K.D.P.A. Shanghai, "CUSTOMS/SHANGHAI" and "I.G. OF CUSTOMS/PEKING" c.d.s. Rare. Photo