Italy: Issued June, 1917 by the Aero Club of Palermo (and) the same design was also issued in 4 bicolor stamps by the Palermo Philatelic Club ... listed in Landmans'
Catalogo Delle Cartoline e Vignette Ufficiali e Semiufficiali di Posta Aerea Italiana... They are not listed in Sanabria as semi-officials, so I suspect they were of a commemorative nature. The surcharged varieties are listed in Mosbaugh's "Red Cross Seals of the World" catalogue.
" [Ray Petersen] via [rs]
(overprint on stamps of Austria): Czechoslovakia: semipostals (1919)
POSTA FIUME
Fiume: triangular newspaper stamp
POSTA PNEUMATICA
Italy: pneumatic tube post
POSTA ROMANA CONSTANTINOPOL
(overprint on stamps of Romania): Romania- Offices in Turkey (1919)
POSTA UKR. N. REP. SCHAGIW
(surcharge on stamps of Austria): Western Ukraine- Stanislau local {Ukrainska Narodnia Respiublika Schaiw (Ukrainian People’s Republic Schagiw-currency)}
POSTAGE
(with denominations in pies, annas or rupees): India- Hyderabad