CALIBER/browser
CORPUS EXPORT · 12269 calibers · 59387 family views · round round/2026-09-08Compiled from app/public/data/ · corpus 70c0140eba.
Family treeSea-Gull ST36 — Heritage family: 7 calibers, 6 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 →
clone ofclone ofvariant ofébauche ofébauche ofébauche ofDugena 3911 (Unitas 6497) — open caliber pageDugena 3911 (Unitas 649…1950maker not sourced1 exec · grade ?Dugena 3913 (Unitas 6498) — open caliber pageDugena 3913 (Unitas 649…1950maker not sourced1 exec · grade ?Hangzhou 9000 series — open caliber pageHangzhou 9000 series—Hangzhou Watch Facto…1 exec · grade ?Omega 960 (Unitas 6497) — open caliber pageOmega 960 (Unitas 6497)—maker not sourc…1 exec · grade ?Sea-Gull ST36 — the caliber this page is aboutSea-Gull ST36—Tianjin Sea-Gull Watch Group1 exec · grade ?Unitas / ETA 6497 — open caliber pageUnitas / ETA 64971950ETA SA Manufacture Horlogère…1 exec · grade ?Unitas / ETA 6498 — open caliber pageUnitas / ETA 6498—ETA SA Manufacture Horlogère…1 exec · grade ?
accepteddisputed
Sense of “family”Heritage · 7Everything (debug) · 7Parts cluster (Jules Borel sense) · 1Manufacturer-internal (Ranfft sense) · 1Based-on star (WatchBase sense) · 7Open the full family view →

movement

Sea-Gull ST36

Tianjin Sea-Gull Watch Groupyear not sourceddesign:seagull-st36compare 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
Sea-Gull ST36
movementproducer: Tianjin Sea-Gull Watch Group
IIDesignations — 0 names

No designation is recorded for this design yet.

IIIExecutions — 1 article

No source in this corpus states which grade any Sea-Gull ST36 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-st36/unknown

Specifications

No attribute has been recorded for this design yet. Nothing is inferred from its relatives: a value on a parent or a sibling is never inherited.

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.

Sources

  1. 1
    chinesewatchwiki.net
    https://chinesewatchwiki.net/Clone_movements
    wikitier 3retrieved 2026-08-243 facts on this page
  2. 2
    Caliber Corner
    https://calibercorner.com/eta-unitas-caliber-6497-vs-6498/
    curated dbtier 2retrieved 2026-08-241 fact on this pagecited, never crawled
  3. 3
    Monochrome Watches
    https://monochrome-watches.com/history-eta-unitas-6497-and-6498-hand-wound-lepine-savonette-movements-technical-guide/
    presstier 2retrieved 2026-08-241 fact on this page
  4. 4
    Internet Archive
    https://web.archive.org/web/20181106134924/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&Dugena_3911
    archivetier 2retrieved 2018-11-061 fact on this page
  5. 5
    Internet Archive
    https://web.archive.org/web/20181106134936/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&Dugena_3913
    archivetier 2retrieved 2018-11-061 fact on this page
  6. 6
    Internet Archive
    https://web.archive.org/web/20171119001912/http://www.ranfft.de:80/cgi-bin/bidfun-db.cgi?10&ranfft&&2uswk&Omega_960
    archivetier 2retrieved 2017-11-191 fact on this page