The first of a series of Brownie cameras was simply called the Brownie. The original model, introduced in February 1900, had a removable back that pushed on to the camera and was held by two spring clips. No view-finder was provided so 'V' sight lines were marked on the top of the camera. In July an accessory finder was made available, as this was optional the sight lines remained.

The original model was made for only a very short time as it was realised that the back clips were a weak point. The improved model (April 1900), still called the Brownie, was introduced with a hinged back and a sliding catch to keep it in place.

When introduced exposures were on either celluloid or paper roll-film. The paper option was soon discontinued.

In 1901 the camera was designated No. 1 Brownie when other sizes were introduced. The finish of the Original, improved and early versions of the No. 1 models was smooth, later a grained finish was used.

The camera was particularly aimed at children and others new to photography. As with the Kodak camera of 1888 Eastman produced a low cost camera aimed at a particular market and backed this with intensive marketing and mass production.

The price of the camera was 5/- and 1/- for the finder, celluloid film cost 7d and 5d for paper film.