These are getting harder and harder to find, particularly in good condition. This is a CD 150 Brookfield spiral groove. It is dark aqua and has some amber streaking. Only damage I can see is a very small and hard to see base flake associated with a small open bubble. Overall, it is in vnm condition and it will be hard to upgrade. it has been part of my collection for many years. These insulators are very under-rated and have an underpriced book value. Price is $400 plus actual shipping costs.