The Giroux Daguerrotype camera was introduced in September 1839; a copy to the same design by Susse Freres went on sale ten days before the Giroux. Both used the same lens made by Paris optician Charles Chevalier. The Susse sold for 350 francs which is about 9,000 pounds sterling in today's currency. Giroux's camera was the only one made under Daguerre's direct supervision. It sold for 400 francs.
The camera design was a double sliding box with a plate size of 16.5 x 21.5cm (6 1/2 x 8 1/2"), from which the term full plate or whole plate originated.
Source: A History of Photography in 50 Cameras, by Michael Pritchard FRPS. 2014.