ChinaHong Kong 1937 Registered Airmail Envelope to Manila
bearing 5c Violet SG121 (5) and 5c Blue-Green SG134 (2), and 10c Blue-Brown SG135 (2), tied by Hong Kong Airmail double-ring with First Flight via P.A.A. Clipper, from Macao-Hong Kong received Manila 1937 cachet in Violet. (pt)
