Looks like oil on canvas. Could be acrylic. It is 28 x 23 inches. In original frame.
Thank you for your appraisal inquiry with Mearto. The item presented appears to be an offset lithograph on canvas after a 1968 painting by Joseph Links titled "The Cutty Sark." The print depicts the British clipper ship, which is now docked on the River Thames, London. Unfortunately, there is no definitive biographical information regarding the artist. However, the painting is available for public use on several stock image websites and provide the artist's name. Because of the accessibility of the image, the print has been printed and reprinted throughout the years in a variety of methods. The estimate is based on recent auction estimates and results of depictions of this ship as an offset lithograph or giclée on canvas. Thank you and please take care.