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1937 Trans-Pacific airmail FAM 14 Sc C21 The 1937 Trans-Pacific airmail FAM 14 Sc C21 refers to the U.S. 20-cent green "China Clipper" airmail stamp (Scott C21), issued February 15, 1937, for the expanded Trans-Pacific service to Hong Kong and Macao, featuring the iconic Boeing 314 flying boat, and was part of a series (C21 & C22) to accommodate new reduced postage rates for routes beyond Manila. Key Details: Scott Number: C21. Denomination: 20 cents. Color: Green. Design: The China Clipper flying boat (Boeing 314). Purpose: Accommodated new reduced rates for the expanded Trans-Pacific route. Issue Date: February 15, 1937, with the first flight to China March 24, 1937. Related Stamp: Paired with the 50-cent C22 stamp for the same service. What it Signifies: This stamp marked a significant expansion of U.S. airmail service across the Pacific, connecting San Francisco to China via routes through Guam, Wake Island, and Midway Island, using Pan Am's famous "Clipper" flying boats. In Summary: When you see "1937 Trans-Pacific airmail FAM 14 Sc C21," think of the green 20¢ China Clipper stamp, a key part of postal history celebrating technological advancement and global connection. American Philatelic Society dealer member American Numismatic Association life member Note: Import duties, taxes, and charges are not included in the item price or shipping cost. These charges are the buyer's responsibility. Please check with your country's customs office to determine what these additional costs will be prior to bidding or buying.

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