3/4" Copper/Black Mottled Antique Shank Back Metal Button #SWC-140
Smooth with mottled texture and black/copper colors, faux rustic, faux antique, 3/4" / 18mm. diameter, or a bit less. Slightly domed. Shank back with approx. 2mm opening. Newly made to look old.
We also have these in 5/8" and 1" in other listings. They match.