Laos 1923 French Indo-China PSE / Rare Cancel Upper Laos

Postal Stationery Envelope "4 on 10c" Orange upgraded with Yvert 73, "4/5 on 2c" Pale Brown (5), tied by Phongsaly Laos double-ring, routed via Luang-Prabang and Vien-Tiane to Pnom-Penh Cambodia and forwarded to Saigon with Saigon Central Cochinchine arrival. Scarce cancel from Upper Laos on Postal Stationery. Ex Wallburg Gold medal collection. (pt)

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