Cover to "εις τον Εκλαμπρότατον κύριον Αλέξανδρον Μαυροκορδάτον πρόεδρον ...." (Alexander Mavrokordatos), posted ONLY with 2-line registered post mark "ΣΥΣΤΗΜΕΝΟΝ/Αρ.188" to Athens. Only small part of the arrival cancelation visible. Prepaid postage rate "45+45/90" (lepta).