I believe this one has a mold number on its top. If anyone needs that info please write. This piece has all of the lookin's of a Brookfield, especially from the 1890-1910 era. Not that I am anything of a Brookie expert, this is from my observation among older Brookfield-made tolls and some gut feeling here! This one is the darkest I have seen of this type, rivaling some of the Denver made AT&T tolls. I think someone mentioned on ICON that the Baltimore Glass Manufacturing Co. could have made some of these huskier, larger-letter Am. Tel. & Tel. Co. CD 121s. especially the purples, light purples and the off-clears. More research is needed here!