Can anyone identify this one for me please? Nicely made, not too heavy, with a small polished pontil, optic ribbed - the ribs have a slight spiral to the left (anti-clockwise), polished top rim, nice quality. Height: 8" / 200mm Diameter at top: 4" / 100mm Diameter at base: 3" / 75mm Weight: 533g / 18.80 oz.