This piece is among the bunch I recently bought from a Brimfield, MA flea market antiques dealer. This insulator distinctly is light green and appears to have "Oakman" style threading. Please note the Oakman patent "collapsible threading" hinge marks at the top of the pinhole! It also has a very faint "X" on top of its crown (not shown). Joe M looked it over and commented that this piece has an unusually narrow wire groove as well! He has seen a few of these before but far and few in-between. And from his recited notes all were in light green glass with such a tight-fitting groove for the line wire!

Tracey Beckham