Picked up this great sign today in Lolo, MT of all places. It measures 12 x 18 and is one sided porcelain. Condition, as you can see, is not to bad. Needs a good cleaning but I'm going to leave the rust stains, just want to get the dirt off. I was told it came off of a substation perimeter fence. I'm not familiar at all with this company or their signs. Any info out there on how common they are or when they were first used? Thanks Roger Z