Not exactly an expert when it comes to insulators, but have collected/dealt in early glass for 50+ years (mostly bottles). Offered here is a nice deep dark aqua CD 136.4 unembossed Boston-type insulator. I've noticed with these Boston-types, that it's quite difficult to find them without some sort of damage to the wire ridge, particularly those with the narrow sharp ridges like this one. Flaws here include a pot stone/rock in the skirt with some radiations, 1"-1 1/2" area of chipping/roughness along the wire ridge, a flat shallow chip/flake at the bottom of the skirt near the base edge, another 1/2" chip off the bottom wire ridge, & a "hard-to-see" base edge bruise (I have to hold it at just the right angle to see it). There's also bit of subtle amber streaks in the dome/skirt that you may or may not see in my images. Please look at all my images for the best description. Asking $95 plus exact shipping. PayPal friends and family is my preferred form of payment.