Poland, 1939 (Aug 26), three-service cover to the U.S., franked Sc. 319 (2), 324, sent by air and express, each with proper label, as well as registered with hand stamp + label indicating it had passed through currency control, properly backstamped, mild central horizontal crease not affecting, a remarkable and scarce cover, Very Fine to Extremely Fine. Suggested Bid $100-150 (Image)