This little glass insulator is just neatness in one tiny package.CD 137 that is tentatively called the "hockey puck" for obvious reasons. Embossed HEMINGRAY 0-4::.{1945 MFG date} (RS)D-990 /15.Insulator is VVNM condition and displays perfect. There's a little soot on the skirt seen in pic, I'll dip it in oxalic to clean it up before shipping. $15 + $5.50 shipping.