I purchased this instrument from Edward Jay earlier this year. You can see the exact instrument on his website and YouTube channel (links below):   http://edwardjay.net/paragraphsView.aspx?siteid=61&headerid=107&siteHeader=Hayden ←(Note layout shown at the bottom of this page)     As Edward's website states, it's a 74 button (40RH + 33LH + Air) Hayden/Wicky Duet Concertina with 8-fold leather bellows and a square frame.   The instrument comes with the c