Here is an original antique / vintage black bakelite Instrument Pointer Knob. 

Marked "DAKA-WARE CHICAGO" on bottom. 

1/4" round center hole with set screw. 

Measures 1-1/4" X 3/4"across bottom, 5/8" tall.

In excellent vintage condition. 

SAME-DAY FREE USPS FIRST CLASS SHIPPING WITHIN USA. 

See my other listings for more vintage or antique knobs!

(stock location ref 53)