Seiko Data-2000

Seiko's watch-computer program began with the Datalog promo piece in the late 1970s and matured through the microprocessor era. The Data-2000's defining input device was a specialist keypad dock: typing on its keys wrote to the watch's memory through electromagnetic control coupling. This contactless, transformer-like link let a wrist-worn device inherit the ergonomics of a full desktop keyboard without compromising the watch's sealed, waterproof-watch form factor. It is a genuine wireless-sync artifact — no pins, no serial cable — achieved with induction at a time when connecting two computers meant pulling out a cable.

The Data-2000's memory was modest — roughly 2,000 characters of addressable text, with practical recalled capacity described as small (on the order of a few hundred digits of memos per screen). The 4x10 LCD was strictly read-only; there was no way to edit data on the watch. All authoring happened at the dock, and the wrist simply replayed the stored text. This asymmetric, honest division of labor — desktop authors, wrist consumes — is the same trade-off the museum's sibling Seiko RC-1000 (see its section) refined the same year by switching to a wired, computer-driven RS-232C serial dump.

The Data-2000 seeded Seiko's 1980s wrist-computer line that grew into the RC-1000/RC-4000 'PC Datagraph' and the RC-4500 'WristMac'. The WristMac was worn on Space Shuttle Atlantis (STS-43) in 1991 for the first email sent from space. While the Data-2000 itself sold in collector-niche numbers and its nonstandard data bank and limited storage kept it from the mass market, historians and collectors consistently cite it as the earliest practical 'computer watch,' putting it at the very beginning of the smartwatch timeline.