The strength of the button shows through in the design and color of this china button.  It was certainly made for a man in mind. Measures 20 mm or 3/4 inch.   Broad fish eye two hole button with the illusion of blue lips around the fisheye.  These buttons were not made with any great care back in the day.  Smudges of blue show on the back.  Color around the edges is rough.  This was an utilitarian button.