ChinaHong Kong 1937 Registered Airmail Envelope to USA
bearing 30c Purple-Yellow SG127, 50c Green SG128, and $2 Red-Grey SG130 tied by Hong Kong Airmail double-ring with Hong Kong to San Francisco Received-First Flight F.A.M. 14 cachet in Blue. First through Trans Pacific Air Mail Flight Hong Kong - Manila - USA by Pan American Airways "Clipper" in Red. (pt)
