I have been in correspondence with the seller and he has given me some info on the second LeJeune that is in the same auction. He indicates it is 531 also, but has Mafac brakes and Simplex derailleurs. This would imply Simplex ends on the frame. Still a nice bike, but to some not as desirable as the Campy equipped versions. Thought if anyone was considering this auction, they might like to know. Current bid is 30 Euro and just over a day to go.
Seller also has a 54cm Gitane TT bike.
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Lynn Travers
Hazelwood, MO