2 Fr. chamber of commerce stamp with overprint "Liberation" in mixed franking with 4 Fr. Petain with same overprint on registered letter from "Batz sur Mer 9.5.45" to La Turballe with arrival postmark on the back from 11.05.1945, due to the letter posting after the ceasefire resulted the overprint "LIBERATION" on the stamps, expertise Lothar Herbst VP (2025) "the condition is perfect.