This early type II 1953-1954 CURTA calculator #502328 is a rare find for any Curta collectors, especially since it is the rare all black version. The type ll version was designed by Curt Herzstark in Liechtenstein during the mid-1950s and is a true testament to the ingenuity of early scientific instruments. The calculator has been well-preserved and is in excellent working condition, making it a valuable addition to any collection. 9.5 out of 10 for condition. I've listed all of the photos showing that all the button functions properly. Doesn't look like it has had much use during its life because it is almost flawless other than a few light surface scratches.  Don't miss your chance to own a piece of scientific history.