243. English Balance Scale. Roberval principle. Equal arm. All brass, ornate design throughout. Oblong base 9-5/8" wide x 7-3/8" deep; front and side troughs; four legs. Two inkwell holders on base with inner porcelain wells. Receptacle with four nested weights centered between inkwells. Postal rates inscribed on one plate. Markings: "Warranted Accurate. STS Trademark."