This is a super piece of history in very good condition

The Imperial Special Rapid Photographic Plate is a vintage film format designed for black and white photography. With a film speed of 200, this 4¼ x 3¼ inch plate was specifically tailored to fit cameras, offering photographers the ability to capture crisp and detailed images.
In very condition.

Due to the age of the item (100+ years) the emulsion could be completely fogged and possibly not usable for photography.