Vintage BECO Linemans touch button Butt Telephone Test Handset Parts Only

Vintage, BECO, Lineman's, touch button, Butt Telephone, Test Handset, for Parts Only. The coating around the clips is not great and sticky, see photos. Needs replaced. This smells like dirt and grease because it is used. I have no way to test this so it's parts only. With original box. PARTS ONLY.