Registered cover fr. with 3x2dr lithos canc. "ΘΕΣΣΑΛΟΝΙΚΗ ΣΥΣΤΗΜΕΝΑ*7.OKT.926", arr. "GROSSEREITENBACH*12.10.26". Boxed "FOIRE INTERNATIONAL DE SALONIQUE" (1st International Fair). Registration label No.9, P.O. most likely P.O. set up at the Fair. Very fine and scarce.