12-Inch Stanley Folding Caliper Rule No. 36-1/2 | Vintage Tool in Boxwood & Brass c. 1920-1940

For the craftsman … a vintage Stanley folding boxwood caliper rule, Model No. 36-1/2, circa 1920-1940. This 12-inch rule is crafted from solid boxwood with brass joints and a sliding brass caliper head for inside and outside measurements.  Still fully functional and in remarkable condition, it would make a notable addition to a gentleman’s workbench, desk, or tool collection.

The Stanley Rule & Level Company was producing caliper rules in boxwood as early as the 1850s.  Combining a standard folding rule with a built-in caliper allowed machinists, patternmakers, and engineers to measure both external diameters and internal openings, and transfer dimensions without reaching for a separate instrument.  By the early 1940s, the company were formally cataloging and marking right- and left-hand versions of the 36-1/2 as separate models.  Our example is right-handed.

Dimensions: 12” (not including caliper head) x 11/16” x 5/32”
Weight: 1.9 oz.

Condition notes: Very good vintage condition overall with light wear, small marks, and mild discoloration to the boxwood consistent with age and careful use. Boxwood arms retain smooth surfaces and warm, even tone with no cracks, splits, or structural issues observed at the folds. Marked “STANLEY,” “MADE IN USA,” “NO. 36 1/2,” and “WARRANTED BOXWOOD,” all clear and legible. Graduations along both faces remain dark and readable, including 8ths, 12ths, 16ths, and 32nds, with the caliper slide graduated in 16ths and 32nds. Brass caliper head, slide, hinge plates, and end hardware are clean and bright with little to no discernible oxidation, showing only faint surface marks from handling. Brass hinge joints are tight and secure; rule opens and closes firmly with smooth, even action. Caliper slide moves freely within its channel and seats properly against both inside and outside measuring faces. Rule has been lightly cleaned and polished.  Other items in photos not included.

Unless noted, all items are hand-wrapped and gift-boxed. We offer flat rate shipping via USPS Ground Advantage for $10, or USPS Priority Mail for $15. Orders over $100 ship free via USPS Priority Mail — any shipping charges for orders over $100 will be refunded after checkout. We pack with safety and care using recycled and recyclable materials whenever possible.

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