Mont-Blanc apartment telephones

ATTENTION: for collectors or repairers!
 Here is a "house phone", a toy very similar to the telephones of that time: two handsets, powered by batteries, joined by a wire, allowed people to talk from one room to another.
 A toy from the French brand Mont Blanc.
 This copy is in its original box: it is intended for collectors or DIY repairers: in particular, it is necessary to repair the wire which has lost one of the connection terminals and clean the battery contacts.
 The instructions are attached, as is (see photos).
 A great opportunity for those who love...