Moin Simon, Oliver
I just had a look at the list of ships involved in submarine war held at Vincennes.
On oct. 1st there is only one f/v recorded, her name is PELLERIN though LE PELERIN would sound better and seemingly she was lost. (File 2004, Box 16).
No other f/v recorded one day before or one day after.
LR2006 indicates that the vessel was registered at Lorient (or maybe La Rochelle - I have to check that) under # 2006
Hope my 2 cents contribution is helpful
VBR
Yves