My mother and grandfather were always finding unusual things at garage sales.   Many times, I happened to be there when they brought their treasures home.  This is one of my favorites.  

Green ink well

This inkwell was one of them.  I love the dark green glass.  It has an iridescent sheen to it like carnival glass.  The cap is brass.  If you know more about this piece, the age, maker, please comment below.