I was looking for info on the Hoyt Magnetometer and came across this in my search... pretty cool!
https://books.google.com/books?id=PaYyAQAAMAAJ&pg=PA262-IA3&lpg=PA262-IA3&dq=hoy t+magnetometer+for+sale&source=bl&ots=5pT0I5_qF5&sig=KVmKhW4SwiLc0vc-xg2ZYlv18dM &hl=en&sa=X&ved=0ahUKEwj3jZLT1M_KAhXIqB4KHUUHDsQQ6AEIMjAD#v=onepage&q=hoyt%20mag netometer%20for%20sale&f=false
Robert, Here's one from our accessory collection.
Here's another "Shop" Hoyt Magnetometer from our collection.
Thanks Jay... Would love to place that on the dash along with two pocket watch holders, one for a pocket watch and the other for a pocket barometer/altimeter lastly a speedo...