Hello, 

This listing is for a Mcintosh MPI-4 Max Performance Indicator Original Control Black Knob  Part, it is in good condition, also it may  feet other  models,  please check pictures for details,  pictures are taken from the actual item and you will receive what you can see in the pictures,  if you are looking for other part for this unit please let me know we may have it ( we have some parts that are not listed ),  please email if any questions, and check our other listing for more vintage stereo parts and accessories,  and more items will be listed soon, so check back later, Thank’s.