542. English Steelyard Scale. Molded bakelite beam, 5-7/8" long, calibrated in oz. (0-4). Hanging letter clip affixed to sliding counterpoise in recessed track in beam. Hand-operated by placing letter in clip, holding poise with thumb grip, and pushing beam to drop position. Arrow pointer on poise indicates weight of letter. Markings: "Letter Balance. Made in England." Mfr: Bex. Enclosed in cardboard box.