'MZ was ex-Air Algerie, new 1971, and thence Air Mali, both French-speaking onetime colonies, before coming to Britannia at 15 years old, hence the French placards. That must have been one of the first ADV aircraft. After Britannia it later went on to Europe Aero Services in Perpignan, France's equivalent of Dan-Air for a large charter fleet, oddball old aircraft repository, where the placarding would have come in useful again. If Britannia took it back to Algeria once I wonder who there recognised an old friend !