CALIBER/browser
CORPUS EXPORT · 12269 calibers · 59387 family views · round round/2026-09-08Compiled from app/public/data/ · corpus 70c0140eba.
Family treeGrand Seiko 9R02 — Heritage family: 2 calibers, 1 sourced lineage link.Drag to explore.
100%drag to pan · hover a caliber to isolate its line · scroll the page normallyopen the full family view →
derived fromCredor 7R14 — open caliber pageCredor 7R14—Credor1 exec · grade ?Grand Seiko 9R02 — the caliber this page is aboutGrand Seiko 9R022019Grand Seiko1 exec · grade ?
accepteddisputed
Sense of “family”Heritage · 2Everything (debug) · 2Parts cluster (Jules Borel sense) · 1Manufacturer-internal (Ranfft sense) · 1Based-on star (WatchBase sense) · 2Open the full family view →

movement

Grand Seiko 9R02

Grand SeikoMicro Artist Studiointroduced 2019design:grand-seiko-9r02compare specs · 2

Identity

A caliber is three separate things and this reference keeps them apart: the construction, the names it is sold under, and the article a brand actually bought. A watch model points at an execution — never at a bare construction — which is why “same caliber” is almost never a complete answer.

IDesign — the construction
Grand Seiko 9R02
movementproducer: Grand Seikodesigner: Micro Artist Studio
IIDesignations — 0 names

No designation is recorded for this design yet.

IIIExecutions — 1 article

No source in this corpus states which grade any Grand Seiko 9R02 was bought at. That unknown is stored as a real row rather than left blank, so it can be counted, filtered and excluded from any comparison that would otherwise assume parity.

unknownsynthetic
evidence: unknown
Tolerances for this caliber at this grade
Measured
worn claim
Mean rate, centre
0 s/d
Mean rate, tolerance
± 1 s/d
Power reserve, typical
84 h
Sampling
unknown

These figures belong to this caliber at this grade, and to nothing else. The same grade name on another caliber from the same maker carries different numbers.

no source states which grade this article was bought at — this row exists so 'unknown' stays countable instead of becoming an assumption

exec:grand-seiko-9r02/unknown

Specifications

PropertyValueScopeStatusSources
Jewels
build.jewel_count
39—accepted
Power-reserve indicator
disp.has_power_reserve_indicator
yes—accepted
Escapement family
esc.family
none—accepted
Oscillator architecture
osc.architecture
quartz_crystal—accepted
Barrels
power.barrel_count
1—accepted
Constant-force device
power.constant_force_device
none—accepted
Power reserve (typical)
power.reserve_typical_h
84 h—accepted
Introduced
prod.intro_year
2019—accepted
Caliber supply type
prod.supply_type
in_house—accepted
Quartz oscillator frequency
qz.oscillator_frequency_hz
32768 Hz—accepted
Power source
qz.power_source
mainspring—accepted
Regulator class
qz.regulator_class
glide_wheel_em_brake—accepted
Movement technology
qz.technology
spring_drive—accepted
Thermocompensated
qz.thermocompensated
unknown—accepted
Hacking seconds
wind.has_hacking_seconds
yes—accepted
Winding mode
wind.mode
manual—accepted

Lineage

The same relationships as the tree at the top of this page, with their sources. An absence in a column means no source stated one.

Ancestors · 1

Where this construction came from. Read up the arrows.

Descendants · 0

What came from it — revisions, variants, clones, licensed copies.

None recorded. An absence here means no source stated one, not that none exists.

Related · 0

Stored in a different table from descent. A successor is not a child.

None recorded. An absence here means no source stated one, not that none exists.

Used by

6
models
1
brands
6
grade unknown

grain 6 reference — every record here sits at the same level, so the count is one kind of thing.

Every brand here is on the strength of a source that names a watch and states this movement. Brands that use this caliber and nobody has sourced yet are absent — this is what has been researched, not what exists.

Sources

  1. 1
    grand-seiko.com
    https://www.grand-seiko.com/us-en/collections/movement/springdrive
    manufacturertier 1retrieved 2026-08-249 facts on this page
  2. 2
    Monochrome Watches
    https://monochrome-watches.com/baselworld-2019-grand-seiko-spring-drive-hand-wound-sbgz001-sbgz003-sbgy002-sbgy003-price/
    presstier 2retrieved 2026-08-242 facts on this page
  3. 3
    Monochrome Watches
    https://monochrome-watches.com/grand-seiko-masterpiece-collection-sbgz007-spring-drive-9r02-review-price/
    presstier 2retrieved 2026-08-243 facts on this page
  4. 4
    grand-seiko.com
    https://www.grand-seiko.com/us-en/collections/movement/springdrive/9r02
    manufacturertier 1retrieved 2026-08-248 facts on this page