Wheatstone 2667
This is a rosewood ended tutor model first sold on July 19, 1851 according to the Wheatstone ledgers at the Horiman Museum. I bought it on eBay in October of 2003. It was renovated in spring 2006 by the Button Box. It is the quietest concertina I have ever encountered.
Left Side 
Right Side 
Bellows
Some sound samples: