Description

Phenomenal, Very Rare Frank H. Coe Patented Automatic Bevel Square

In the Unheard‑Of Original Box — Sole Manufacturer: Boonton, New Jersey

An exceptional and extremely rare example of the Frank H. Coe Patented Automatic Bevel Square, made in Boonton, New Jersey, and presented in its original box—a survival so scarce that most collectors will go their entire lives without encountering one. Coe’s patented mechanism represents one of the most ingenious 19th‑century solutions for rapid, repeatable angle setting, and examples in any condition are prized. In the original box, this borders on museum‑level rarity.

This piece shows the unmistakable early Coe construction: the clever automatic locking action, the finely machined components, and the distinctive form that sets it apart from other patented bevels of the era. The mechanism operates smoothly, and the tool retains a wonderfully crisp, untouched look that speaks to careful storage rather than use.

The original box—a true unicorn in the world of patented layout tools—retains its period character and elevates this example into the top tier of surviving Coe bevels.

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