For sale:
Wheatstone 62-button Maccann duet concertina -- Serial # 35731 -- for sale at $2,850 or best offer, however, buyer must pay all shipping costs.
http://www.horniman.info/DKNSARC/SD03/PAGES/D3P0560L.HTM
Here is a general comment about this instrument by a professional concertina specialist: "(Regarding) the three buttons off to the left that are marked "BA", WH", and "WV". The WV button is standard - it's what most players call an air release, but Wheatstone referred to it as a "Wind Valve". The other two are novelty buttons which are uncommon on