DescriptionPlumb bob, 6481-6, made by Keuffel & Esser Company, (Hoboken, N.J.), no date, circa 1950-1960. Machined brass with screw cap and replaceable hardened steel point; six ounce; 4-1/8" long x 1-1/8" diameter. With string cord. The "6" in the product number indicates weight, this being the smallest of this style which went up to 24 ounces. K&E main offices and factory were in Hoboken during the period when this was manufactured.