This insulator is EIN [010] and is much harder to come across than the guide would suggest. Its the first i've come across in years of collecting. Has a couple issue's a 1/4" flat chip on dome and a 1/4" flat chip at mold line in wire groove. Book shows a light aqua but in hand it looks more blue aqua. Due to it being hard to find i'm asking $45.00 U.S. + shipping. PayPal accepted in family friends mode and i will accept checks and postal money orders.