CALIBER/browser
CORPUS EXPORT · 12269 calibers · 59387 family views · round round/2026-09-08Compiled from app/public/data/ · corpus 70c0140eba.
Family treeSea-Gull ST19 — Heritage family: 3 calibers, 2 sourced lineage links.Drag to explore.
100%drag to pan · hover a caliber to isolate its line · scroll the page normallyopen the full family view →
revision oftooling transfer ofSea-Gull ST19 — the caliber this page is aboutSea-Gull ST192003Tianjin Sea-Gull Watch Group1 exec · grade ?Tianjin ST3 — open caliber pageTianjin ST31965Tianjin Sea-Gull Watch Group1 exec · grade ?Venus 175 — open caliber pageVenus 175—Fabrique d'Ebauches Venus SA1 exec · grade ?
accepteddisputed
Sense of “family”Heritage · 3Everything (debug) · 3Parts cluster (Jules Borel sense) · 1Manufacturer-internal (Ranfft sense) · 2Based-on star (WatchBase sense) · 2Open the full family view →

movement

Sea-Gull ST19

Tianjin Sea-Gull Watch Groupintroduced 2003design:seagull-st19compare specs · 3
bounding evidence — no range is drawn on the era axis
not after 2015
a dated example movement, ca. 2010 (+5 yr, the source says “circa”)“ca. 2010: - ; Seagull”
not before 1965
Tianjin ST3 · introduced 1965 (sourced)a revision is not earlier than what it revises · ← revision of · rule IR-1 · depth 1 · acceptedthe anchor's own source

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
Sea-Gull ST19
movementproducer: Tianjin Sea-Gull Watch Group
IIDesignations — 3 names
IssuerNameKindDisambiguated bySources
Tianjin Sea-Gull Watch GroupST19catalog—
Tianjin Sea-Gull Watch GroupST-1901catalog—
Tianjin Sea-Gull Watch GroupTY2901parts trade—
IIIExecutions — 1 article

No source in this corpus states which grade any Sea-Gull ST19 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

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

exec:seagull-st19/unknown

Specifications

PropertyValueScopeStatusSources
Introduced
prod.intro_year
2003—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 · 2

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

1
models
1
brands
1
grade unknown

grain 1 model — 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
    chinesewatchwiki.net
    https://chinesewatchwiki.net/Tianjin_Seagull
    wikitier 3retrieved 2026-08-246 facts on this page
  2. 2
    Caliber Corner
    https://calibercorner.com/tag/st1901/
    curated dbtier 2retrieved 2026-08-242 facts on this pagecited, never crawled
  3. 3
    Internet Archive
    https://web.archive.org/web/20220129015509/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a&2uswk&Seagull_ST19
    archivetier 2retrieved 2022-01-291 fact on this page