cover 1935 envelope to France (4.4 arrival) showing unframed "CANNONÈRE FLUVIALE/'BALNY'" h.s. and double-ringed "MARINE FRANCAISE/SERVICE DE LA MER" cachet and on reverse three-line "Forces Navales en Extreme-Orient/Flottile du Uang-Tsi-Kiang/Cannonière Fluviale 'Balny'" h.s., all in violet, endorsed "F.M."; slight rust spotting. Rare. Photo