Vintage plastic postal scale by Sterling Plastics

Sterling Plastics manufactured adjustable postal scales from the 1960s through the 1980s in the United States. These compact, affordable scales were designed for home and small office use, allowing users to weigh letters and packages to determine correct postage rates. The sliding chart displayed postal rates for different weight classes, making it a practical tool before digital scales became commonplace. These postal scales appeal to collectors of vintage office equipment, postal memorabilia enthusiasts, and those interested in mid-century American manufacturing. They represent an era when letter-writing was the primary form of communication and accurate postage calculation was essential for everyday correspondence. Such items are valued for their nostalgic charm, functional design, and as examples of practical consumer products from the pre-digital age.