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The Encyclopedia of Horology

Component record · Case

Case

Verified

The external housing that protects the movement, dial and hands from dust, moisture and physical damage.

What it does

Encloses and protects the movement while providing the means to view the dial (via the crystal) and access the crown, and in many designs to hang or carry the watch.

How it works

A case is typically built from several parts — case body (middle), bezel, crystal, case back and pendant — assembled to seal and protect the movement while allowing dial visibility and crown access.

Water-resistant cases use gaskets (rubber, later synthetic elastomers) at the case back, crystal and crown/stem junctions, plus a screw-down or snap-fit case back, to exclude moisture to varying depth ratings.

Case hallmarks, import marks and maker's marks stamped inside the case back or on the case body are important primary evidence for dating and attributing a watch, independent of the movement.

Evolution

From simple hinged, unsealed cases to fully sealed, gasketed, water-resistant cases developed through the 20th century as sports and diving watches demanded greater environmental protection.

Known variations

  • Open-face case
  • Hunter case (hinged cover over the dial)
  • Half-hunter case
  • Screw-back case
  • Snap-back case
  • Monocoque (one-piece) case

Identification for collectors

  • Case hallmarks and maker's marks (often on the inside of the case back) are primary dating and attribution evidence, and can be independent of the movement's own markings
  • Case wear patterns, replaced crystals, or refinished surfaces can affect authenticity and value assessments

Common failure modes

  • Gasket perishing, compromising water resistance
  • Case cracking or denting from impact
  • Hinge or clasp wear on hunter cases

Photographs

Manistee watch case intact
Manistee watch case intact — Doug Coldwell, CC BY-SA 3.0. Wikimedia Commons file page
Watch Case MET 81051
Watch Case MET 81051 — Unattributed Wikimedia Commons contributor, CC0. Wikimedia Commons file page
Watch case MET 40551
Watch case MET 40551 — Unattributed Wikimedia Commons contributor, CC0. Wikimedia Commons file page

Photographs are illustrative examples of the type, not necessarily the exact object described. Verify details against the source file page.

Sources & references

  1. Britten, F. J., Old Clocks and Watches and Their Makers
  2. de Carle, D., Watch and Clock Encyclopedia

Where sources disagree, the disagreement is stated rather than resolved silently.