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According to Allied this piston goes for $170, I have had two music shops look at it and confirm the serial numbers. I'm asking $75 but will entertain other offers, Like selmer sousaphone pistons or tuba mouthpieces. It does have a button with it, but it is not shown

http://www.ebay.com/itm/271341723953?ss ... 1555.l2649" target="_blank