• A type I Curta calculator, complete with its original plastic canister case. The underside of the Curta is marked System Curt Herzstark Made in Liechtenstein by Contina AG Mauren Type I No 74355.  
   
• The calculator is sold with its two original Curta instruction manuals and the original numbered cardboard box. The calculator is in good working order and is in excellent condition, the instruction manuals and box are a little worn.
   
• The calculator has 8 digits for data entry, a 6-digit revolution counter, and an 11-digit result counter.
   
• Type I Curta calculators started production in 1947, this example was made circa 1969, not long before production ceased in 1970.
   

The Curta, a small hand-cranked mechanical calculator, was designed by Curt Herzstark and first introduced in 1947, the larger type II version was introduced in 1954. The calculator has an extremely compact design and can be used to perform addition, subtraction, multiplication, division, and —with more difficulty— square roots and other mathematical operations.

For more details of the Curta calculator and its history see www.vcalc.net and www.curta.org .