The index page for the 1954 French flap section of this site is here.
Reference number for this case: 7-Oct-54-Ballon. Thank you for including this reference number in any correspondence with me regarding this case.
[Ref. 552] AIME MICHEL:
French ufologist Aimé Michel indicates that on October 7, 1954, a little later than the observation of the same day in Saint Jean d'Assé, that is, a little later than 06:20 of the morning, and a few kilometres from Saint-Jean d'Assé, in Ballon, two flying objects were seen, which he writes were similar to those seen in Saint-Jean d'Assé and by the workmen of Renault.
Not looked for yet.
(These keywords are only to help queries and are not implying anything.)
Ballon, Sarthe
[-] indicates sources which I have not yet checked.