For sale is a genuine new-old-stock Selmer Mark VI baritone saxophone neck receiver or socket. It has never been installed on an instrument. It is bare brass and tarnished and needs to be soldered onto the sax. The installer may wish to buff/polish it and spray it with lacquer in order to make it shine and keep it from tarnishing. Selmer is known to have made some alterations in Mark VI's over the years, so it is possible that something may need to be altered in order for this part to fit as it needs to.  It's possible that it may fit other Selmer models.  We have only seen one other place that has one of these available (overseas) and it's listed for $150.