New old stock knobs from former Moog factory in Asheville, NC. Manufactured by Cosmo for Moog. Circa 2010s. 
Item number KNB-01-000-0040.

Black plastic with silver top round insert and two white indicator dots. "Medium skirt" design. 1" round at base. Approx. 9/16" tall. 

These have a small flat head set screw and no metal insert in the shaft hole. 

I think these were for Moog Modular units but appear same/very similar to Minimoog knobs and should fit any 1/4" shaft.  

These are bulk packaged and will be shipped in bubble wrap. I do my best to ship in one business day. Price is for one knob. Combined shipping cost if you buy multiple. 

Please let me know any questions - thanks for looking!