Seiko 8L55

	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)