UP FOR AUCTION IS A SELDOM SEEN U. S. GOLD COIN COUNTERFEIT DETECTING SCALE. PAT. DATE OF 1855 BY JOHN ALLANDER. THERE ARE TWO MODELS THE MORE COMMON ONE DETECTS FIVE DIFFERENT COINS, THE 20, 10, 5, & 21/2 DOLLAR. THIS ONE ADDS THE THREE DOLLAR TO IT AND IS MORE SCARCE. IT IS DESIGNED TO DETECT DIAMETER, THICKNESS, AND WEIGHT. THE SCALE IS IN EXCELLENT CONDITION. I DO NOT HAVE THE ORIGINAL COUNTER WEIGHT (IT WOULD BE PLACED IN THE ONE DOLLAR SLOT FOR BALANCING THE 20 & 10 COINS) I PURCHASED IT YEARS AGO WITH A REPLACEMENT THAT LOOKS GOOD BUT I DO NOT KNOW IF IT IS ACCURATE. THE SCALE DISPLAYS NICELY AND WOULD MAKE A NICE ADDITION TO A COIN OR SCALE COLLECTION.