Any ideas as to the maker of this please. In natural light the glass is optical, which may not show on pictures. I managed to find one that is exactly the same and sold as a Whitefriars piece, ebay Item No. 261142827538.
Having looked at a passed thread, even though the hat was different to this posted, there was some controversy over whether Whitefriars or not. On a small section on the edge of the bowl as shown in pictures, there appears to be a fault. The outer and inner surfaces within the same area are not damaged. Your help is appreciated
Height 6.8cm, pontil dia. 2.7cm.