1973 SEIKO BELL-MATIC Watch Ref. 4006-6027 Automatic Alarm Wristwatch Day/Date Indicator

SEIKO Alarm Watch  Seiko introduced the Bell-Matic, their alarm wristwatches, in 1966 but the history of the mechanical alarm wristwatch begins in in the early 19th century when two different watchmakers attempted to produce alarm wristwatch, but these projects were failures. It was until 1942 when Vulcain began production of a prototype alarm movement, later named the 120. Finally, released to the public in 1947, the Vulcain Cricket: the first alarm wristwatch.  It was until 1966 that Seiko developed its own alarm watch, the Bell-Matic, containing either the 4005 or 4006 movement. The The caliber 4005 (date only variety) used just for two years in 1968 and 1969, and the caliber 4006 is the day/date variety.  How it works: As the Vulcain, the Seiko utilizes two separate barrels for storing power. This ensures that the power required to ring the bell does not detract from the power reserve for timekeeping.  Seiko took a different approach and dispensed with hand winding the watch entire