Double weight front cover fr. with 2x15sld Lombardo - Venetto 5th issue stamps canc. "GALATZ*12/9" to Syra. Marked "40", fr. on arrival with 40l greyish rose on grey-lilac to pay the Greek double fee, canc. "ΣΥΡΟΣ*19.ΣΕΠΤ.66". An extremely rare postal history item. (Hellas 20IIa).