Skip to content
WatchtheDetails

Movement · Seiko · automatic

Seiko 6R35 movement

Seiko 6R35 is an automatic movement by Seiko: 27.4 mm1secondary source across, 5.25 mm1secondary source high, 243 jewels, beating at 21,600 bph3, 70 h3 of power reserve. 19 watches in our base use it (list).

Sources checked · How we source numbers
Seiko 6R35: movement drawingSeiko 6R35, dial side, to scale: movement diameter 27.4 mm; date 3H window (size unknown); height 5.25 mm; hour, minute, second hand hole Ø — (unknown).movement Ø 27.4date 3Hsize —, position onlyØ 27.4 = 12.15‴5.25SIDE · SECTION · height 5.25Ahour, minute, second hand hole Ø —DETAIL A · 10:1
Seiko 6R35, dial sideDrawing from data, not a photo · mm

6R35 at a glance

Diameter
27.4 mm1secondary source
Height
5.25 mm1secondary source
Jewels
243
Beat rate
21,600 bph3
Power reserve
70 h3
Accuracy
−15 to +25 s/day3
Do not set the date
21:00–01:003

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

Setting and servicing the 6R35

The figures a watchmaker or a timegrapher needs for the 6R35, as Seiko prints them.

Accuracy (maker)
−15 to +25 s/day3Only if worn on the wrist in a temperature range of 5 C to 35 C
Power reserve
70 h3
Do not set the date
21:00–01:003
Hacking seconds
Yes3
Hand winding
Yes3

Watches with the 6R35

What fits the 6R35

The figures a dial, hands or case must match for the 6R35, as Seiko prints them.

Date window
3H2secondary source

Same family at Seiko

How each differs from the 6R35, worked out from the figures on its own page.

All 6R35 figures

Every figure we hold for the 6R35, with its source. Where sources disagree, each value is shown.

Size

Diameter
27.4 mm1secondary source
Height
5.25 mm1secondary source

Running

Jewels
243
Beat rate
21,600 bph3
Power reserve
70 h3
Hands and functions
hours, minutes, centre seconds, date4
Hacking seconds
Yes3
Hand winding
Yes3

Accuracy and care

Accuracy (maker)
−15 to +25 s/day3
Do not set the date
21:00–01:003

Fitting: dial, hands, stem

Date window
3H2secondary source

Origin

Made from
20192secondary source

Not published yet

  • Diameter: not published
  • Height: not published
  • Lift angle: not in the documents we read
  • 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

Versions

6R35A[1]

6R35 questions

How accurate is the 6R35?

Seiko rates the 6R35 at −15 to +25 s/day, measured under Seiko’s own test conditions; a worn 6R35 can run outside the −15 to +25 s/day range.

Source [3]

Which watches use the 6R35?

19 watches in our base name the 6R35: SBDC091, SPB117, SPB119, SPB121, SPB123, SPB155 and 13 more.

How long does the 6R35 run when fully wound?

About 70 h from a full wind, per Seiko.

Source [3][1]

When should you not change the date on the 6R35?

Not between 21:00 and 01:00, per Seiko: the 6R35’s date change is engaged then, so move its hands past 01:00 before using the quick-set.

Source [3]

Does the 6R35 hack and hand-wind?

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

Source [3]

More on movements

Sources

Documents checked · Report a wrong number

  1. 1CaliberCorner — Seiko Caliber 6R35 watch movement page · html · read
  2. 2Grail Watch — Grail Watch Reference: Seiko 6R35 · html · read
  3. 3Seiko Watch Corporation — Diver's watch for air diving instructions, Cal. 6R35 (EN) · pdf · read
  4. 4Seiko Watch Corporation — Mechanical watch instructions, Cal. 6R31/6R35/6R38 (EN) · pdf · read
  5. 5Right Time International — SBDC091 pre-owned listing, Right Time (Denver), dealer spec block · html · read
  6. 6Right Time International — SPB117 listing, Right Time (Denver), dealer spec block · html · read
  7. 7Right Time International — SPB119 listing, Right Time (Denver), dealer spec block (listing, sold out) · html · read
  8. 8Right Time International — SPB121 listing, Right Time (Denver), dealer spec block · html · read
  9. 9Right Time International — SPB123 listing, Right Time (Denver), dealer spec block (listing, sold out) · html · read
  10. 10Seiko Watch Corporation — SPB155 product page (us-en), seikowatches.com · html · read
  11. 11Seiko Watch Corporation — SPB157J1 product page (Prospex), seikowatches.com global-en · html · read
  12. 12Seiko Watch Corporation — SPB159J1 product page (Prospex), seikowatches.com global-en (US page 404) · html · read
  13. 13Seiko Watch Corporation — SPB165J1 product page (Presage), seikowatches.com global-en · html · read
  14. 14Right Time International — SPB167 listing, Right Time (Denver) - authorised dealer, retailer spec block (sold out) · html · read
  15. 15Seiko Watch Corporation — SPB169 product page (Presage), seikowatches.com global-en · html · read
  16. 16The Watch Company — Seiko Prospex SPB197J1 listing, The Watch Company - retailer spec block · html · read
  17. 17Seiko Watch Corporation — SPB199J1 Mountain Glacier, SEIKO PROSPEX Alpinist Limited Edition campaign page, seikowatches.com it-it · html · read
  18. 18Seiko Watch Corporation — SPB209 product page (Prospex), seikowatches.com global-en · html · read