PO in Serbia 1847 (Aug 7): Registered entire letter from Belgrad to Pest with crisp "BELGRAD 7. AUG." (Müller 178a) and "RECOM:", red registration sign, reverse with "NETTO DI FUORA ET DI DENTRO" Semlin carantine handstamp (Meyer type E). (Image 1) (Image 2) (Image)