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Movement · Seiko · automatic

Seiko 8L35 movement

Seiko 8L35 is an automatic movement by Seiko: 261 jewels, beating at 28,800 bph1, 50 h1 of power reserve. 3 watches in our base use it: Marinemaster 1968 Heritage Diver's Watch, Marinemaster 1968 Heritage Diver's Watch (list).

Sources checked · How we source numbers
Seiko 8L35: movement drawingSeiko 8L35, dial side, to scale: movement diameter — (unknown); date 3H window (size unknown); height — (unknown); hour, minute, second hand hole Ø — (unknown).movement Ø —date 3Hsize —, position onlyheight —SIDEAhour, minute, second hand hole Ø —DETAIL A · 10:1
Seiko 8L35, dial sideDrawing from data, not a photo · mm

8L35 at a glance

Jewels
261
Beat rate
28,800 bph1
Power reserve
50 h1
Accuracy
−10 to +15 s/day1
Lift angle
53°2secondary source
Do not set the date
20:00–02:002secondary source

New to the terms? Read quartz vs automatic or watch movement types.

Watches with the 8L35

Setting and servicing the 8L35

The figures a watchmaker or a timegrapher needs for the 8L35, as Seiko prints them.

Lift angle
53°2secondary source
Accuracy (maker)
−10 to +15 s/day1Only if worn on the wrist in a temperature range of 5 C to 35 C
Power reserve
50 h1
Do not set the date
20:00–02:002secondary source
Hacking seconds
Yes1
Hand winding
Yes1

What fits the 8L35

The figures a dial, hands or case must match for the 8L35, as Seiko prints them.

Date window
3H3secondary source

All 8L35 figures

Every figure we hold for the 8L35, with its source. Where sources disagree, each value is shown.

Running

Jewels
261
Beat rate
28,800 bph1
Power reserve
50 h1
Hands and functions
hours, minutes, centre seconds, date1
Hacking seconds
Yes1
Hand winding
Yes1

Accuracy and care

Accuracy (maker)
−10 to +15 s/day1
Lift angle
53°2secondary source
Do not set the date
20:00–02:002secondary source

Fitting: dial, hands, stem

Date window
3H3secondary source

Origin

Made in
Made in Japan2secondary source
Made from
20013secondary source
2 sources disagree; show every value
  • secondary source 20013
  • secondary source 20003

Not published yet

  • Diameter: not in the documents we read
  • Height: not in the documents we read
  • Lift angle: not published
  • Hand holes: only in Seiko’s drawing; not read yet
  • Dial feet: only in Seiko’s drawing; not read yet
  • Stem part number: not published by Seiko
  • Do not set the date: not published

8L35 questions

Which watches use the 8L35?

3 watches in our base name the 8L35: Marinemaster 1968 Heritage Diver's Watch, Marinemaster 1968 Heritage Diver's Watch, SLA017.

What is the lift angle of the 8L35?

53°, as Seiko prints it. Enter 53° on a timegrapher to read amplitude correctly for the 8L35.

Source [2]

How accurate is the 8L35?

Seiko rates the 8L35 at −10 to +15 s/day, measured under Seiko’s own test conditions; a worn 8L35 can run outside the −10 to +15 s/day range.

Source [1]

How long does the 8L35 run when fully wound?

About 50 h from a full wind, per Seiko.

Source [1][3]

When should you not change the date on the 8L35?

Not between 20:00 and 02:00, per Seiko: the 8L35’s date change is engaged then, so move its hands past 02:00 before using the quick-set.

Source [2]

Does the 8L35 hack and hand-wind?

Yes, it hacks: the seconds hand stops with the crown pulled out. It can be wound by the crown.

Source [1]

More on movements

Sources

Documents checked · Report a wrong number

  1. 1Seiko Watch Corporation — Mechanical watch instructions, Cal. 8L35 (EN) · pdf · read
  2. 2CaliberCorner — Seiko Caliber 8L35 watch movement page · html · read
  3. 3Grail Watch — Grail Watch Reference: Seiko 8L35 · html · read
  4. 4Seiko Watch Corporation — SLA077J1 | Seiko Watch Corporation · html · read
  5. 5Seiko Watch Corporation — SLA079J1 | Seiko Watch Corporation · html · read
  6. 6Right Time International — SLA017 listing, Right Time (Denver), dealer spec block · html · read