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Movement · TMI (Seiko Instruments) · mecha-quartz

Seiko VK64 (TMI) movement

Seiko VK64 (TMI) takes SR936SW2, lasting about 3 years2. It is a mecha-quartz movement by TMI (Seiko Instruments): 30.8 mm1 across, 5.1 mm1 high, accurate to ±20 s/month2. 2 watches in our base use it: Undiné VK64-515B568, Undiné VK64-515E628 (list).

Sources checked · How we source numbers
TMI VK64: movement drawingTMI VK64, dial side, to scale: movement diameter 30.8 mm; casing diameter 29 mm; size 13½‴; height 5.1 mm; hour, minute, second hand hole Ø — (unknown).movement Ø 30.8casing Ø 2913½‴ as printed · Ø 30.8 = 13.65‴5.1SIDE · SECTION · height 5.1Ahour, minute, second hand hole Ø —DETAIL A · 10:1
TMI VK64, dial sideDrawing from data, not a photo · mm

VK64 at a glance

Diameter
30.8 mm1
Height
5.1 mm1
Battery
SR936SW2
Battery life
3 years2
Accuracy
±20 s/month2
Jewels
02
Hands and functions
chronograph, 24-hour hand, date3
Do not set the date
21:00–03:004

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

Watches with the VK64

Battery for the VK64

  • SR936SW[2]Sizes and equivalents of the SR936SW on its page

What fits the VK64

The figures a dial, hands or case must match for the VK64, as TMI prints them.

Casing diameter
29 mm2

Running the VK64

Accuracy and battery figures for the VK64, as TMI prints them.

Accuracy (maker)
±20 s/month2
Battery life
3 years2
Do not set the date
21:00–03:004

Same family at TMI

How each differs from the VK64, worked out from the figures on its own page.

All VK64 figures

Every figure we hold for the VK64, with its source. Where sources disagree, each value is shown.

Size

Size in lignes
13½‴3
Diameter
30.8 mm1
Casing diameter
29 mm2
Height
5.1 mm1

Running

Jewels
02
Hands and functions
chronograph, 24-hour hand, date3

Accuracy and care

Accuracy (maker)
±20 s/month2
Do not set the date
21:00–03:004

Power

Battery
SR936SW2
Battery life
3 years2

Origin

Made in
Japan3

Not published yet

  • Low-battery sign: not published
  • Hand height options: only in TMI’s drawing; not read yet
  • Hand holes: only in TMI’s drawing; not read yet
  • Dial feet: only in TMI’s drawing; not read yet
  • Stem part number: not in the documents we read

Versions

VK64A32 · VK64A32B[7]

VK64 questions

Which watches use the VK64?

2 watches in our base name the VK64: Undiné VK64-515B568, Undiné VK64-515E628.

What battery does the TMI VK64 take?

The TMI VK64 takes SR936SW; TMI gives 3 years of life.

Source [2]

When should you not change the date on the VK64?

Not between 21:00 and 03:00, per TMI: the VK64’s date change is engaged then, so move its hands past 03:00 before using the quick-set.

Source [4]

More on movements

Sources

Documents checked · Report a wrong number

  1. 1Time Module Ltd. — TMI Watch Movement Specification and Drawing (Spec Sheet) VK64 · pdf · read
  2. 2Time Module Ltd. — TMI Technical Guide & Parts Catalogue VK64 · pdf · read
  3. 3Time Module Ltd. — Product Line-Up - Premium Chronograph (VK): VK61-VK73 blocks · html · read
  4. 4Time Module Ltd. — TMI Operation Manual VK64 · pdf · read
  5. 5Vostok-Europe — Undiné VK64-515B568 · html · read
  6. 6Vostok-Europe — Undiné VK64-515E628 · html · read