Incoming Belgian, registered cover, franked with six Belgian various commemorative stamps depicting Queen Astrid and Prince Baudouin with surtax for raising funds for Public Utility Works, [Michel 444, 445, 446, 447, 448 and 450 (key value of the set)], tied with Brussels (01.05.1937) postmark, plus registration “BRUXELLES / BRUSSEL / 1 / 774” and airmail “PAR AVION / PER VLIEGTUIG” labesls. Examined by the Service for the Protection of the National Currency, in Athens, with “ΕΛΕΓΧΟΣ ΣΥΝΑΛΛΑΓΜΑΤΟΣ / CONTROLE DU CHANGE” re-sealing tape, tied with arrival Athens, Registered Airmail postmark “ΑΘΗΝΑΙ - ΑΦΙΞΙΣ ΣΥΣΤΗΜ. ΑΕΡΟΠΟΡΙΚΩΣ* -3 V 37”. Backside handstamped with violet cachet: “Εντός της παρούσης επιστολής ευρέθησαν [manuscript: (F.B 200 —) επιταγή διακοσίων Βελγικών φράγκων] / ΤΡΑΠΕΖΑ ΕΛΛΑΔΟΣ , Ο ΠΡΟΪΣΤΑΜΕΝΟΣ ΤΟΥ ΣΥΝΕΡΓΕΙΟΥ - Ο ΑΝΤΙΠΡΟΣΩΠΟΣ ΤΟΥ ΥΠ. ΣΥΓΚΟΙΝΩΝΙΑΣ - Ο ΑΞΙΩΜΑΤΙΚΟΣ ΤΟΥ ΥΦ. ΔΗΜ. ΑΣΦΑΛΕΙΑΣ “, (Inside this letter were found (200 B.F.) check for two hundred Belgian francs. / Bank of Greece, The Manager of the Workshop - The Representative of the Ministry of Transport - The Officer of Deputy Ministry of Public Security), also original signatures plus the same as above arrival Athens, Registered Airmail postmark and Paleo Phaliro postmark “ΠΑΛΑΙΟΝ ΦΑΛΗΡΟΝ * -4 ΜΑΙ 37”. VF and R.