For many years moveable posting-boxes were placed on board various cross-channel steamers plying between England and the continent. They were first used as early as the 1840s and their use was regularized under the Anglo-French Postal Convention of 1856. Letters posted in these boxes received special postmarks inscribed variously 'Moveable box', 'Boite Mobile', or the initials 'M.B.' or 'B.M.' Moveable box facilities were removed shortly before the Second World War.
- R. J. Sutton 6th edition revised by K. W. Anthony
The Stamp Collector's EncyclopaediaPublished 1966Posted December 27, 1999
Index of 507 Notes from the Past
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