Very Rare!  This is a 'Brand New'  (old stock) Eumig Replacement Sound Head for the Eumig Mark-S Regular 8mm Sound Movie Projector .  Comes in the original OEM case.  Very easy to install.  Only one is available.

Note:  Please make sure you are purchasing this product for the Eumig Mark-S Regular 8mm Sound Projector as this part is not returnable.  This head will  not  work for the Super 8mm model.