Flyer seems to be advertising to French ferry users visiting Portsmouth.
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LANDPORTS
COMMERCIAL ROAD - PORTSMOUTH 21221
Vous souhaite la bienvenue a Portsmouth et a un Grand Magazin.
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South Parade Pier caught fire 11th June 1974 while shooting the film "Tommy". https://en.wikipedia.org/wiki/South_Parade_Pier
More information from Michael Cooper: http://www.michaelcooper.org.uk/C/sppierfire.htm