1945, a registered cover from La Baule to Batz, St. Nazaire, 1945-04-18. featured emergency St. Nazaire local occupation stamps overprinted for the French liberation. The cover was franked with Liberation overprints on all stamps, totaling 6f in postage value, including  'Ship' 2f. stamp and 4f. (Michel No.  2 2Fr+ Yv 522 f4 )  Catalog value is €500.