Postal Stationery item

Quality: PWST

1923, Stibbe no RU 15, "15c. + 15c. on 5c. + 5c. green", sent from Postes Militaires (military field post office) July 9, 1923 to Brussels / Belgium, with Belgian label "Inconnu / onbekend" and Belgian postman cachet "330 D", very interesting and scarce, vf