cover 1925 XU5 from Switzerland, bearing Swiss 50c. Air cancelled "BASEL" (10 June) carried on an internal flight to Thailand and affixed with 1925-37 Air 3s. and 25s. cancelled "BANGKOK" (5 July) and showing special airmail cachet of "UBOL" on reverse, fine

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cover 1925 XU5 from Switzerland, bearing Swiss 50c. Air cancelled "BASEL" (10 June) carried on an internal flight to Thailand and affixed with 1925-37 Air 3s. and 25s. cancelled "BANGKOK" (5 July) and showing special airmail cachet of "UBOL" on reverse, fine

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