We just visited Paris as well, and played a 'ukaferri' by Dominique Chevalier at the François Charle shop in the Vero-Dodat gallery.
Charle is an authority on Selmer-Maccaferri guitars - in fact, he wrote the book about them. He codesigned the Chevalier ukaferris, which look a lot like the Dupont ones: d-holes, spruce tops, fixed bridges without moustaches (as with the 'concert' nylon strung Selmer guitars) and no 'plié' or fold in the top. The main differences are in overall finish, size (the Chevalier ones are between soprano and concert size, the Dupont ones are a bith north of a tenor size), open versus closed headstock with geared versus friction tuners, fretboard markers (none on the Dupont) and fretboard extension (22 frets on the Dupont versus 19 on the Chevalier).