I have made reproduction back door sheets for the Caille Silent Sphinx with the hydraulic clock or pump as most collectors call it, if anyone is interested. I have two different copies, shown below. Size of sheet is 9 1/4" wide by 12 3/4" high. Cost is $3.00 each, plus shipping.
Below, is a picture of the Caille Silent Sphinx machine that the back door sheet is for. The machine is not for sale, it's just for illustration.