Vintage USA Made 3/16 inch 4.76 mm Shaft Bakelite Knob - Free Shipping
Shaft size is 3/16inch(4.76mm) which is smaller than the common 1/4 inch (6.35mm) size.
Sizes in photos are in metric but you can convert to inch(1 inch=2.54cm).
Made in USA
Free shipping via airmail takes 7-14 days to most parts of the world from Korea.
Some remote regions may take somewhat longer.