A Brunsviga 13RM Mechanical calculator: Serial number 13RM 14068. In good condition and in full working order. This model was in production form 1964 - 1970, and be used to perform addition, subtraction, multiplication and division tasks. It is the last Brunsviga working according to the “Original Odhner” model. If you're a some who collects vintage equipment you'll be very interested in this rare item.