Hello all !   I recently acquired a lovely Lachenal, 32b, tuned Bb/F (renovated by Emmanuel Pariselle) I'd appreciate help for dating ! It seems like this instrument was actually reassembled with parts from (at least) two concertinas, because the left and right reed pans are made of a different wood. The right pan has two empty slots so it was likely originating from a 36b instrument.   There is a serial number 42408 on the frames. There is another number