I don't believe that this is a jumele style frame but rather a drewed berceau style frame. If you enlarge the picture and extend the mid-stays to where they would mate with the seat stays, there appears to be a small remnant of the mid-stays attached to the seat stays. Attaching the mid-stays at this higher point eliminates the need for the more complicated s-bend used on many mixte drive side mid-stays to provide chain clearance.