Kingman Arizona Turquoise S&S Enricher Choke Knob (Striped Chalice)

21mm (0.82in) diameter polished stainless steel machined knob. (Striped Chalice)
18mm (0.70in) Kingman Arizona turquoise cabochon. 
For Super E/G S&S carburetors 

The buttons are handmade. They may show signs of manufacturing.