Sedona Sun Shank Back Metal Button Silver 15/16" / 23mm (Larger Size) #MV-19
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, $2.50 each.
This is the larger size, we also have 3/4" in another listing - both sizes are shown in the photo with the ruler.