Bulgaria: 1912 (5 February) return to sender registered overprinted 10st postal stationery card (Mi. P29) uprated with 25st from Rustchuk to Hong Kong carried by French – Yokohama (Japan) liner. Reverse 12.03 Yokohoma * Marseille No. 1, 30.III Varna and 11.IV Bulgarian TPO date stamps. Very rare.
