This insulator is a CD 121 embossed on the front Canada with B.T.C. Montreal blotted out. It is the  listing in the book. The insulator is a light aqua color with the entire insulator full of light steamy milky bubble swirls. It is hard to photograph but looks really cool with base lighting. The insulator is in near mint condition with only a short 1/2" factory annealing crack in the threads. A very nice displaying Canadian insulator. $80.00 plus shipping cost. Payment by PayPal friends or gift mode or check. More photos available on request.