1939 comp. 2 pcs of Reg letters with red special postmark BRATISLAVA/ MOBILE POST OFF. (BUS)/ OTVORENIESNEMUSLOVENSKEKRAJINY/ 18.I.39, 1x R service letter without vyplacenéhoR-příplatku, franked with. pair stamp. 50h green, Štefánik, Pof.346 (vertical fold in envelope) + 1x Reg letter with 10Kč/300h, Pof.350; good condition