Good concertinas were never mass produced.
Lachenal introduced some mass-production methods, but I don't think you'll find that applies to their top-of-the-range Edeophone models.

Hope yours finds a good home, Jon. Mary would have been tempted a couple of months ago but then fell in love at first squeeze with a 1914 56-key tenor treble that had just fallen into Steve Dickinson's hands. An overhaul and tuning from Steve and it's one of the best-playing concertinas on the planet. As seen (and heard) at festivals and clubs this Summer!

Anahata