I photographed this gem in a window shot last summer and thought that getting an underlit view of this piece deserves justice. Joe M also has an identical insulator however it is unmarked (yes, a Pennycuick). It is interesting that a few CD 162 NEGMs are also known and have very similar (but not quite as "stormy") seed bubble scatterings throughout their glass. There presently is no confirmed historical connection between the NEGM and Pennycuick insulators. Note: this piece is medium aqua with greenish tones.