Never got to grips with weights, so taking a slightly educated guess this one could be Scottish. The clear dome has a definite sun-purpled appearance, though even now I'm not entirely sure it's not being caused by the purple coloured cushion. Smallish snapped pontil scar, and a good amount of wear - could be 50 years plus in age, but again only guessing - could be more or equally less - another recent charity shop acquisition. About 2.25 inches high with diameter c. 3 inches (55 mm x 75 mm). Unfortunately, now parted with the couple of p/weight books I did have so very much in the dark, and appreciate any ideas on ID and thanks for looking.