Seidel & Naumann - XxX - 1906
"The Seidel & Naumann stepped drum XxX machine was manufactured circa 1906.
This particular machine (serial number 576) has its beautiful wooden case intact. The case features a sliding bottom panel that can be used to access the mechanism without having to detach the machine from its base." Jay M. Goldman.

Courtesy of:  Jay M. Goldman

X-Number World of Calculators