Both the Junior and Academy were nothing more than a slightly updated Williams No.2. The most obvious changes were the elongated spacebar, heightened top posts and the addition of an enclosure for the type lever springs behind the keyboard. A decal just behind the rear typebars identifying the model may be present.
Williams Junior Typewriter
Williams Typewriter Co.
Derby, Connecticut, US
It was common practice to extend the life of a model long after it was rendered outdated or obsolete. Sometimes the original manufacturer did so to sell off old stock, as was the case with the Fox's Rapid brand, and sometimes it was another manufacturer simply attempting to capitalize on an already established brand, as with the Manhattan. The Junior (and Academy) from the Williams Typewriter Company falls into the 1st category.