Vintage National Company Radio Vernier Dial For Sale

This listing is for the old world, 1930s National Vernier Dial, shown in the photos.
Made for 1/4\" shafts, the dial size is roughly 100 x 75mm, about 25mm deep, including the control knob.
I have popped off the shaft cover so you can see the shaft housing and set screw.
Checked out and everything functions as originally designed. Comes with mounting screw hardware.
Guaranteed to be in good functional condition. Always willing to discount and combine shipping charges for multiple purchases.