AIRMAIL COVER (6.10.38), from Athens to Salonica, backstamped with "ΘΕΣΣΑΛΟΝΙΚΗ ΑΦΙΞΗΣ ΑΕΡΟΠΟΡΙΚΩΣ" and special arrival cachet "ΑΕΡΟΠΟΡΙΚΩΣ ΑΦΙΞΗΣ" and airplane. This type of cachet was used only by the Salonica Post Office during 2 months!. RR and F