The Model B was the first machine to be made widely available to firms in New Zealand. Some confusion exists as to the naming convention for these machines, with "Model C" also having been used according to 'The Postage Stamps of New Zealand, Vol III'.
The five value dies were mounted on a quadrant and selected by a rotary lever on the front of the machine, with inking being achieved by a typewriter ribbon which was mounted on spools on either side of the casing.
The Model D was an improved version of the earlier Model B/C machine, with added security features and an upgraded inking system.
The Model E was developed from the Model D. Although similar internally, the intricate cast casing was replaced by sheet steel to reduce cost and manufacturing time.