The Number 2A actually stands for the film size, not when it was introduced. Kodak came up with a numeric designation for sizing its early cameras: the larger the number, the larger the film (and image). And of course to make things interesting, they used a different set for their Brownie cameras:
|0||0||1 5/8 x 2 ½|
|1||2||2 ¼ x 3 ¼|
|1A||2A||2 ½ x 4 ¼|
|2C||2C||2 7/8 x 4 7/8|
|3||3||3 ¼ x 4 ¼|
|3A||3A||3 ¼ x 5 ½|
|4||—||4 x 5|
|4A||—||4 ¼ x 6 ½|
|5||—||5 x 7|
Happily they gave up on that and began using their film sizes as designations, because the film sizes weren't quite as confusing.
This is a pretty standard early Brownie. They were made to be as cheap as possible because they were aimed at children and the working class who wanted a camera but couldn't afford better; the equivalent of disposable cameras today.
The Brownie box just doesn't change much for forty-some years. The early ones, like this one here, are leatherette-covered card, a meniscus lens, two shutter speeds ("instant" and "time") and two apertures. It's virtually the same camera as my later Brownie Target 616 except that the later models were all-metal.
Mine is in good shape. It's worn around the edges but it's all there and not beaten too badly. The shutter works nicely, a testament to the reliability of simple mechanics. It's almost impossible to date these things, but from the descriptions in my reference books, I put it between 1917 and 1918, when they added a metal plate on the back that my camera lacks.