Hi there!  This is an antique cast iron enamel bathroom sink.  Great for a classic retro project as these have become highly sought after!  It's dirty, but still in pretty good shape with some rust.  There are many do it yourself fixes for old enamel sinks.  It is 21" 'long' by 17.5" wide by 5" tall.  The tall backsplash makes the total height 12.5".  The basin is 13.5" 'long' by 9.5" wide by 6" to 7" deep.  First $50 takes it!  Thanks for looking!