Seiko Caliber M705

Seiko Caliber M705

Seiko Caliber M705

ManufacturerSeiko
Caliber NumberM705, M705A
Movement TypeQuartz, digital
Display TypeNematic Liquid Crystal with Field Effect Mode (FEM)
Diameter
34.2mm
Height
6.48mm
Jewel Count
No jewels (0)
Beat Rate / Frequency
28,800 bph / 4 Hz
Accuracy Rating
Less than 15 seconds/month
Battery Cell #
CR2025 (lithium, 3 V)
Battery Life
3 years
Current Consumption
2.2 uA (movement) / 1.8 uA (circuit block)
Regulator
Trimmer condenser
FunctionsSee below…
Country of ManufactureMade in Japan
Known Models
Seiko Scubamaster (Ref: M705-5A10, M705-5A00) (Add your watch to the comments below…)

The Seiko caliber M705 (M705A) is a digital quartz watch movement found in various Seiko digital Scuba Diver’s watches.

In Seiko’s own words:

“The Seiko Scubamaster Cal. M705 is a computerized diver’s watch featuring a built-in electronic depth gauge and automatically displays the data required in making a dive.”

Seiko M705 Front Back

Functions:

In addition to the normal digital time and calendar display, the M705 also has:

  • Depth meter up to 80m
  • Dive display
  • Dive table
  • Diver’s log
  • Alarm (daily)
  • Warning/communication beeps
  • Illuminating backlight
  • Battery life indicator (EOL)
  • All Clear (AC) Reset

Instructions Manual:

Seiko M705 Scubamaster Instructions Manual

Official M705 Technical Guide/Tech Sheets (pdf):

Additional Resources:

Seagull Caliber St19

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