Sedona Sun, Shank Back Metal Button Silver 13/16" / 20mm (Smaller Size) #MV-20
We think these are vintage 1970's. Round button, silver and black with a bit of sheen. The sun outlines are slightly recessed. Slightly domed, with a 3mm shank opening. Limited Supply, $2.00 each.
This is the smaller size, we also have 15/16" in another listing - both sizes are shown in the photo with the ruler.