To my knowledge, this is a brand new discovery! The profile of this gem is nearly identical to the CD 577.5 except the measurements are only 2 1/4" wide x 3" tall. Even has the extended ridge on the top of each "ear." Embossed with the rare slanted "S" in Star variant only previously known on the CD 577.5. Insulator is a beautiful Dark Green with surface (cold pour) annealing lines on the skirt (not cracks) and one small 3/8" base flake. For a view of the profile [id=422139720 ]. Just assigned CD 563.6

First email can catch this shooting Star insulator for only $185 plus shipping. Thanks!