The Junior is a great little lantern with a long and rich history. The first globes used in them would have to be the 00 Dietz U.S. Tubular. I have seen no evidence that the cold blast shape came along any earlier than the Dietz logo series. There are at least 4 different Junior globes with the logo. Because of the patent set, I can date your side lamp to 1912-1913. The original globe only has Junior embossed under the Dietz logo and will react to black light. The models after that have Junior Cold Blast and the logo on one or both sides. Then there is the Junior Loc-Nob with the bogus patent date.
The name returns to Junior Wagon Lamp sometime in the 1920's. I need a bigger sample from that period to figure out when.