This has been in a science classroom for years and I’m doing some cleaning and decided this can go. It is a little dusty. It has Signal Electric MFG. CO, Menominee, Mich. written on the side and is labeled 4 OHMS. If you are into these, I’ll take best offer plus what actual shipping will be. The sale of this will go towards my classroom supplies.
If you have any questions, please send me a message!