Dartmouth Pottery (Devon) tankard with seagull design, c.1950s-60s

A c.1950s-60s Dartmouth Pottery tankard, in shiny white glaze with a large colour transfer picture of a seagull upon a rock to one side, and the words "'tis a guid 'oss that don't stumble" to the other.  The tankard measures approximately 11.3cm (4.45in) in height and 10.2cm (4in) in diameter at the base, which bears two black printed marks: "DARTMOUTH / DEVON / ENGLAND" and "MADE IN ENGLAND" within twin circles; it is in very good condition apart from a few scratches and tiny spot marks.