RR Rare airmail cover 1928 Czechoslovakia to Canton China via Ukraine Hong Kong

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RR Rare airmail cover 1928 Czechoslovakia to Canton China via Ukraine Hong Kong:
$188.35

Czechoslovakia: RARE 1928 registered airmail cover with the overprinted airmail stamps used from Praha via Uschgorod (Ukraine), Port Said (Egypt) and Hong Kong to Canton, China!! Unfortunatly a very dirty cover with some faults, which was found in a cellar! But probably a very rare postal route!!