Calculating machine set in a brass casing and set on an oval wooden mount. The mechanism consists of 14 sets of 6 wheels numbered 1-9 mounted in a row on a single driveshaft. The shaft is turned by a handle at the right end of the device. Turning the handle activates the end wheel, labelled 1--39,and causes the lowest value wheel in each set to rotate, increasing or decreasing the record total. The handle can be pegged into any one of the 39 segments on the end wheel.

No maker's mark (unsigned). Associated with the accountant and calendar reformer Moses Cotsworth.