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Vintage L.S. Starrett No. 603 precision machinist’s steel rule, manufactured in Athol, Massachusetts, USA.
This specialized Starrett rule is divided into six different graduation scales: 8, 16, 24, 32, 40 and 48 divisions per inch. Unlike an ordinary household ruler, these multiple scales allowed machinists, toolmakers, patternmakers and engineers to select the degree of precision needed for a particular layout, measurement or inspection task. The less-common 24ths, 40ths and 48ths scales made this a particularly versatile working instrument for specialized shop calculations and close mechanical work.
The L.S. Starrett Company was founded in Athol, Massachusetts, in 1880 and became one of America’s most respected manufacturers of precision measuring instruments. Starrett tools were built for trades in which accuracy mattered, and steel rules like this one were everyday companions in machine shops, factories and toolrooms. The stamped “THE L.S. STARRETT CO. ATHOL, MASS. U.S.A.” identification connects this piece directly to that long tradition of American precision manufacturing.
This No. 603 displays substantial oxidation, staining, pitting and honest workshop wear developed through decades of use and storage. Even with its aged surface, the Starrett name, model number and many of the finely engraved graduations remain visible. Its weathered appearance gives it strong industrial character and preserves the story of a tool that was made to work rather than merely be displayed.
An appealing piece for a collector of antique machinist tools, American industrial history or Starrett measuring instruments. It would also display beautifully in a vintage workshop, drafting room, tool collection or industrial-style setting. Because of its age and surface condition, it is offered primarily as a collectible; accuracy has not been tested against a certified measuring standard.
Please review all photographs carefully for the exact amount of oxidation, pitting, wear and remaining visibility of the graduations.
