cover 1912 (13 June) envelope express registered to Gembitz bearing 1906-18 1½ dollar tied by two strikes of "TSINGTAU-Gr.HAFEN/KIAUTSCHOU" type 8a c.d.s., showing the appropriate labels and arrival backstamp; also 10c., 20c. and ½ dollar (Bothe guarantee) bearing similar cancellations, good