Pictured Here - Modern Art Glass on a Punty or Pontil.
In a fisheye or pontil piece, you can see how the glass was pulled before being snapped off for final finishing. The Center of the glass remained hot and therefore stretched more as the outside cooled and was more stable. Most fisheye or pontil pieces from Seaham have this characteristic though many are just a hint of color on a tip of white. This piece has several colors indicating art glass was being made that day.