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You are here: Home / Movements / Seiko 8L55

Seiko 8L55

Last Update: February 1, 2020

Brand:Seiko
Family:
Seiko 9S8x Hi-Beat Family
Height:
Jewels:37
Reserve:55 hours
Frequency:36,000 A/h
Winding:Automatic, Bi-Directional Automatic Winding, Central Rotor Automatic Winding
Diameter:
© Seiko Seiko Cal. 8L55 was only used in the limited-edition Prospex SLA025 Complications:Date, Hacking Seconds, Hand Winding, Quick Date Correction
Hands:Central Hour Hand, Central Minute Hand, Central Seconds Hand, Date Window at 3:00
Distinguishing Technical Characteristics
Central-Rotor Automatic
Clockwise Balance Cock
Screw Regulator
Balance
Balance at 1:30
Central Rotor
Production: 2015 – 2019
1910s 1920s 1930s 1940s 1950s 1960s 1970s 1980s 1990s 2000s 2010s 2020s

Cal. 8L55 is a Hi-Beat automatic movement used in the Seiko Prospex SLA025/SBEX001 dive watch. It is a variant of the Grand Seiko 9S85 movement with simpler finishing and adjusted to a lower standard of accuracy. The movement was used in a few rare Prospex dive watches from 2015 through 2019 but is best known for powering the limited edition Prospex SLA025, a re-creation of the 1968 6159-7001 which won the prestigious GPHG award in the Dive Watch category in 2018.

  • 2015-2016 Seiko Prospex SLA025/SBEX001 Hi-Beat Diver (LE of 700 pieces)
  • 2018 Seiko Prospex Marinemaster Professional SBEX005
  • 2018 Seiko Prospex Diver 300m Hi-Beat Ref. SLA025 (LE of 1,500 pieces)
CalibreProductionSpeedJewelsFunctionsModels
Cal. 8L552015-present36,00037DateProspex SLA/SBEX
Cal. 8L882008-200943,20041Power reserveCredor GBBX998
Cal. 9S852009-present36,00037DateGrand Seiko SBGH
Cal. 9S862014-present36,00037Date, GMTGrand Seiko SBGJ

Images are taken from official publications and are used here for commentary and educational purposes. Copyright is held by the original owner as noted.
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