Watch family · Style & purpose
Waterproof (Water-Resistant) Watches
Partially verifiedWatches with a case sealed against water and dust ingress by gasketed crown, case back and crystal, a wristwatch-era construction problem with no close pocket-watch equivalent since a pocket watch is not normally exposed to water in use.
Movement & mechanism
- Screw-down or gasketed case back sealing the movement compartment
- Screw-down or gasketed crown, sometimes with a secondary locking system
- Gasketed crystal seal, in addition to the case-back and crown seals
Identification
- Case back or dial marked 'waterproof' or with a specific water-resistance rating
- Screw-down crown, often with a protective guard
- Thicker case profile than an equivalent non-sealed watch, to accommodate gaskets
Terminology
- Gasket — a sealing ring, typically of rubber or synthetic material, preventing water ingress at a case joint
- Water resistance rating — a depth or pressure figure indicating tested sealing performance
Known variations
- Screw-back waterproof watch
- Waterproof watch without a dedicated depth rating
- Early hermetically sealed 'oyster'-type case designs
Pocket-watch ancestry
Waterproofing addresses a problem specific to the wristwatch's constant, exposed wear on the body rather than a pocket-watch practice being carried over; it drew on general case-sealing and gasket engineering rather than on any established pocket-watch waterproofing tradition, since pocket watches were carried in a pocket and not routinely exposed to water.
Collecting notes
An important precursor category to dive watches, collected for early sealed-case patents and construction as a milestone in wristwatch case engineering.
Background
Water-resistant watches are designed to withstand ingress of water through various seals and are often marked with the static pressure they were tested against. Manufacturers often indicate test pressure using units like bars, atmospheres, or equivalent water depth in meters. Standards such as ISO 22810:2010 help clarify the capabilities of watches intended for daily use rather than professional submarine diving.
Diving watches represent a specific subset subject to the ISO 6425 standard, which requires each individual timepiece to undergo rigorous testing. Actual survivability depends on factors beyond just depth, including seal aging, temperature fluctuations, and mechanical stress.
Written from the encyclopedia entries listed under Sources; each statement was checked against the cited text.
Defining features
- Water-resistant watches are subjected to condensation tests where a drop of water is placed on the heated glass to detect moisture intrusion.
- Diving watches must undergo individual testing in static water at 125 percent of their rated pressure.
- The ISO standard for water-resistant watches also prohibits describing a watch as 'waterproof'.
Later development
- The ISO 2281 standard, introduced in 1990, established testing procedures for watches intended for ordinary daily use.
- The ISO 6425 standard for divers' watches was subsequently introduced in 1996.
Photographs
Photographs are illustrative examples of the type, not necessarily the exact object described. Verify details against the source file page.
Sources & references
- Water Resistant mark, Wikipedia (English), retrieved 2026-10-28 (text CC BY-SA 4.0)
- General literature on early waterproof wristwatch case patents; individual patent priority requires further research.
Where sources disagree, the disagreement is stated rather than resolved silently.