CALIBER/browser
CORPUS EXPORT · 12269 calibers · 59387 family views · round round/2026-09-08Compiled from app/public/data/ · corpus 70c0140eba.

Family line

Hamilton H-31

Based-on star (WatchBase sense)9 calibers8 lineage edges0 related edgesdesign:hamilton-h-31compare specs · 9

This profile traverses clone_of · derived_from · ebauche_of · revision_of · variant_of and keeps disputed edges. Every edge in this view carries at least one reference.

Same caliber, other senses of “family”Everything (debug) · 26 calibersEverything (debug) · 9 calibersHeritage · 26 calibersHeritage · 9 calibersParts cluster (Jules Borel sense) · 1 calibersManufacturer-internal (Ranfft sense) · 1 calibers
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derived fromderived fromclone ofderived fromvariant ofvariant ofvariant ofvariant ofHamilton H-31 — open caliber pageHamilton H-31—ETA SA Manufacture Horlogère…1 exec · grade ?La Joux-Perret L100 — open caliber pageLa Joux-Perret L100—Manufacture La Joux-Perret …1 exec · grade ?Sellita SW500 — open caliber pageSellita SW5002009Sellita Watch Co S.A.3 execValjoux 7733 — open caliber pageValjoux 77331969Valjoux SA1 exec · grade ?Valjoux / ETA 7750 — open caliber pageValjoux / ETA 77501974ETA SA Manufacture Horlogère…1 exec · grade ?Valjoux / ETA 7751 — open caliber pageValjoux / ETA 77511986ETA SA Manufacture Horlogère…1 exec · grade ?Valjoux / ETA 7753 — open caliber pageValjoux / ETA 7753—ETA SA Manufacture Horlogère…2 exec · grade ?Valjoux / ETA 7754 — open caliber pageValjoux / ETA 77542003ETA SA Manufacture Horlogère…1 exec · grade ?Venus 188 / Valjoux 7730 — open caliber pageVenus 188 / Valjoux 77…1948Valjoux SA1 exec · grade ?
Edge types in this family
accepteddisputedcontested region

Generations run left to right, ancestors first, and the axis along the top is ordinal rather than linear: each band is one generation, labelled with the range of sourced introduction years it contains. A band reads “—” when no caliber in it has a year anyone published — the gap is the finding, not a rendering failure. Dotted arcs above and below the drawing are related edges — successor, drop-in, no-derivation — which are stored in a different table from lineage and can never form part of an ancestry path.

Every edge in this view

CaliberRelationshipToStatusDetailSources
Hamilton H-31derived from
lineage
Valjoux / ETA 7753acceptedinterchange note: power reserve reworked from 42 h stock to 60 h — DE-1 fires on barrel/mainspring geometry · component delta: barrel,mainspring
La Joux-Perret L100derived from
lineage
Valjoux / ETA 7750acceptedinterchange note: column-wheel upgrade; the source explicitly says reworked, not a clone
Sellita SW500clone of
lineage
Valjoux / ETA 7750acceptedreworked clone · interchange note: Sellita redesigned the calendar driving wheels to remove the 7750's 8pm-2am date-set restriction — a clone that fixes a known defect of the original · component delta: calendar_mechanism
Valjoux 7733derived from
lineage
Venus 188 / Valjoux 7730acceptedinterchange note: cam-lever architecture; more than 2 million made
Valjoux / ETA 7750variant of
lineage
Valjoux 7733acceptedcomponent delta: automatic_module
Valjoux / ETA 7751variant of
lineage
Valjoux / ETA 7750acceptedcomponent delta: calendar_mechanism,complication_module
Valjoux / ETA 7753variant of
lineage
Valjoux / ETA 7750accepted—
Valjoux / ETA 7754variant of
lineage
Valjoux / ETA 7750acceptedcomponent delta: complication_module

Sources

  1. 1
    Caliber Corner
    https://calibercorner.com/hamilton-caliber-h31/
    curated dbtier 2retrieved 2026-08-241 fact on this pagecited, never crawled
  2. 2
    WatchBase
    https://watchbase.com/hamilton/caliber/h-31
    archivetier 3retrieved 2026-08-241 fact on this pagecited, never crawled
  3. 3
    Monochrome Watches
    https://monochrome-watches.com/valjoux-7750-chronograph-history-50-years-technical-explanation-evolution-clones-in-depth-review/
    presstier 2retrieved 2026-08-247 facts on this page
  4. 4
    Caliber Corner
    https://calibercorner.com/sellita-caliber-sw500/
    curated dbtier 2retrieved 2026-08-241 fact on this pagecited, never crawled
  5. 5
    Caliber Corner
    https://calibercorner.com/eta-valjoux-caliber-7750/
    curated dbtier 2retrieved 2026-08-241 fact on this pagecited, never crawled