Manufactured in the 1930s, this Pierce is an extremely rare waterproof model equipped with a slide-type automatic movement, presented here in excellent condition with a black dial. The components with a grain-finish move up and down to wind the mainspring—an important and fascinating example from the era when watchmakers were still experimenting with automatic mechanisms. This ingenious system, known as a slide-type or linear automatic, is mechanically distinctive and visually unique, appealing not only to movement enthusiasts but also to vintage watch collectors seeking unusual pieces.
This example features a four-screw waterproof case and a military-style black dial with luminous paint and 24-hour markings, making it a particularly rare sports-type variant among slide-automatic models. The dial is signed “AUTOMATIC,” “WATERPROOF,” and “PARASHOCK.” Beyond its rarity, its outstanding preservation makes it a highly valuable reference piece. Though a compact 30 mm, the case has a substantial presence that feels larger than its size.