these 'molar/lobed' designs, with controlled bubbles, seem to first appear in the 1949 catalogue - not that I can see this dish/bowl at that time, and later in the 1953/54 catalogue more designs appear, including bowls and dishes more like this one. Some designs also appear in the 1972 catalogue which I suspect is more likely the date of this one since the later pieces look to have smaller bubbles - anyway I can't see this particular design, so if anyone knows the pattern No. please do shout, and thanks for looking. Diameter is a smidgen over 5.75 inches. The colour could be sea green or willow - I only have the big book which isn't as helpful as the MoL Jackson book for colours.