Otagiri Stoneware Sailboats and Lighthouses Coffee Mug.
This is a beautiful Otagiri Mug, made in Japan
and depicts two Lighthouses, positioned one on the right and one on the left side, plus five Boats sailing away.
Dark Blue outside on the bottom and gray on the top.
Measures 3 3/4" Tall x 3 1/2" Diameter.