This is a beauty.  A really old Yorkshire stone trough.  Unuusally in limestone with wonderful colouring to the stone from the centuries of weather sealing the outside of the stone and giving a wonderful patina.  This trough will look as if it has always belonged wherever it finally ends up.  There is an uneven bit at the base of the back of this where it has lost a piece many many years ago.  Fully sound and absolutely lovely.  Will make a wonderful water trough.  Match it up with a spout for that lovely sound in your garden.