2034
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

細節
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