A rocker type of counterfeit coin detector, produced by Berrian Manufacturing Company of New York. Designed and patented in 1877 by John Thompson of Chicago, who apparently sold the patent to Berrian. It is 241 mm X 51 mm X 10 mm. The device is still housed in what appears to be the original yellow cardboard box in which it was shipped to the customer. A pair of advertising clippings are also included with the lot, which extol the virtues of the piece in typical fashion, and claim that it is worth "four times its cost" ($1.00). The box and advertising circulars are understandably worn by age, while the coin scale (which apparently could also serve as a postage scale) is in Very Fine condition, with some nicks and shallow scratches from honest usage. Listed on page IV-3-1 of U.S. Coin Scales and Counterfeit Coin Detectors, Newman & Mallis (1999).