The Mayfield, Cobb was one of the first cameras to be made of a plastic-like substance such as ebonite. The material does not seem to be very successful as the brass binding looks to have been added to strengthen the body.

In 1889 Mayfield, Cobb was advertising as plate manufacturers.

This model is similar to the previous entry but is not fitted with an internal shutter and has double extension the body is of aluminium rather than ebonite. It isn't clear if this unusual camera was a prototype, a one-off or was intended for sale. An aluminium version of the model with an internal shutter is known to exist but this is the only known example of this model.