Hello. My master did this concertina a few years ago (10 or 15)based on drawings from England. "Hayden concertina" pat.№2131592 NOTE POSITION 7" 65 KEY INSTRUMENT. It have one reed plate!!! And I want finished second instrument of world for this patent and has one reed plate. 1. I am the owner for this tool. 2. Looking for the developer of this concertina.