One Buck Butt
It's a traditional, normal, pressed and rounded, glossy button like Ike and Adlai Stevenson used for their successful and unsuccessful presidential runs. It has a pin in back, and it's made by hand-and-machine with an old industrial button machine that makes one size buttons, about 15/16"/24mm diameter.
You put it on clothes, hats, and bags.
We're experts on four things, none of which are buttons, but that said, this is as fine a button as any of us have ever seen (in living a total of 629 years). The sheen, the symmetry, the spikey thing in the back -- all top drawer stuff.