Kohler 4" bathroom sink fixture, coralais, polished brass finish effect

Description

Never installed.  I think the design is at least thirty years old.
I believe it's complete with parts necessary for installation but I'm not a plumber (my hat's off to them).
The only negative I can find is at the very back left corner just below the knob there is some discoloration.  Please see two photos (#s 6 & 7) which show this area.
A classy looking faucet!