CALIBER/browser
CORPUS EXPORT · 12269 calibers · 59387 family views · round round/2026-09-08Compiled from app/public/data/ · corpus 70c0140eba.
Family treeHamilton H-31 — Heritage family: 26 calibers, 25 sourced lineage links.Drag to explore.
100%overlaydrag to pan · hover a caliber to isolate its line · scroll the page normallyopen the full family view →
derived fromderived fromclone ofderived fromvariant ofvariant ofvariant ofvariant ofébauche ofébauche ofébauche ofébauche ofébauche ofébauche ofébauche ofébauche ofébauche ofébauche ofébauche ofébauche ofébauche ofébauche ofébauche ofvariant ofvariant ofAlfred Rochat 7750 (Valjoux 7750) — open caliber pageAlfred Rochat 7750 (Valjoux 775…—maker not sourced1 exec · grade ?BM 13750 (Valjoux 7750) — open caliber pageBM 13750 (Valjoux 775…1973maker not sourced1 exec · grade ?Dugena 4002 (Valjoux 7733) — open caliber pageDugena 4002 (Valjoux 773…1969maker not sourced1 exec · grade ?Fortis 2001 (Valjoux 7750) — open caliber pageFortis 2001 (Valjoux 7750)—maker not sourced1 exec · grade ?Hamilton H-31 — the caliber this page is aboutHamilton H-31—ETA SA Manufacture Horlogère…1 exec · grade ?IWC 790 (Valjoux 7750) — open caliber pageIWC 790 (Valjoux 775…1973maker not sourced1 exec · grade ?Junghans 688.11 (Valjoux 7733) — open caliber pageJunghans 688.11 (Valjoux 7733)—maker not sourced1 exec · grade ?La Joux-Perret L100 — open caliber pageLa Joux-Perret L100—Manufacture La Joux-Perret …1 exec · grade ?Omega 1150 (Valjoux 7751) — open caliber pageOmega 1150 (Valjoux 775…1990maker not sourced1 exec · grade ?Omega 1151 (Valjoux 7751) — open caliber pageOmega 1151 (Valjoux 775…1994maker not sourced1 exec · grade ?Omega 1152 (Valjoux 7750) — open caliber pageOmega 1152 (Valjoux 775…1995maker not sourced1 exec · grade ?Omega 1154 (Valjoux 7750) — open caliber pageOmega 1154 (Valjoux 775…1992maker not sourced1 exec · grade ?Omega 1155 (Valjoux 7750) — open caliber pageOmega 1155 (Valjoux 775…1990maker not sourced1 exec · grade ?Omega 1156 (Valjoux 7750) — open caliber pageOmega 1156 (Valjoux 775…1990maker not sourced1 exec · grade ?Omega 1158 (Valjoux 7750) — open caliber pageOmega 1158 (Valjoux 775…1991maker not sourced1 exec · grade ?Omega 1164 (Valjoux 7750) — open caliber pageOmega 1164 (Valjoux 775…1995maker not sourced1 exec · grade ?Sellita SW500 — open caliber pageSellita SW5002009Sellita Watch Co S.A.4 execTissot 2060 (Valjoux 7733) — open caliber pageTissot 2060 (Valjoux 773…1970maker not sourced1 exec · grade ?Valjoux 7733 — open caliber pageValjoux 77331969Valjoux SA1 exec · grade ?Valjoux / ETA 7750 — open caliber pageValjoux / ETA 77501974ETA SA Manufacture Horlogère…3 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…3 exec · grade ?Valjoux / ETA 7754 — open caliber pageValjoux / ETA 77542003ETA SA Manufacture Horlogère…1 exec · grade ?Valjoux 7758 (Valjoux 7750) — open caliber pageValjoux 7758 (Valjoux 775…1986maker not sourced1 exec · grade ?Valjoux 7770 (Valjoux 7750) — open caliber pageValjoux 7770 (Valjoux 7750)2004ETA SA Manufacture Horlogère…1 exec · grade ?Venus 188 / Valjoux 7730 — open caliber pageVenus 188 / Valjoux 77…1948Valjoux SA1 exec · grade ?
accepteddisputed
Sense of “family”Heritage · 26Everything (debug) · 26Parts cluster (Jules Borel sense) · 1Manufacturer-internal (Ranfft sense) · 1Based-on star (WatchBase sense) · 26Open the full family view →

movement

Hamilton H-31

ETA SA Manufacture Horlogère SuisseHamiltonyear not sourceddesign:hamilton-h-31compare specs · 5

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
Hamilton H-31
movementproducer: ETA SA Manufacture Horlogère Suissecommissioned_by: Hamilton
IIDesignations — 1 name
IssuerNameKindDisambiguated bySources
HamiltonH-31house—
IIIExecutions — 1 article

No source in this corpus states which grade any Hamilton H-31 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:hamilton-h-31/unknown

Specifications

PropertyValueScopeStatusSources
Jewels
build.jewel_count
27—accepted
Swiss movement
origin.swiss_movement
yes—accepted
Frequency
osc.frequency_vph
28800 vph—accepted
Power reserve (typical)
power.reserve_typical_h
60 h—accepted
Winding mode
wind.mode
automatic—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.

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
    Caliber Corner
    https://calibercorner.com/hamilton-caliber-h31/
    curated dbtier 2retrieved 2026-08-245 facts on this pagecited, never crawled
  2. 2
    Caliber Corner
    https://calibercorner.com/hamilton-caliber-h31
    curated dbtier 2retrieved 2026-09-084 facts on this pagecited, never crawled
  3. 3
    WatchBase
    https://watchbase.com/hamilton/caliber/h-31
    archivetier 3retrieved 2026-08-241 fact on this pagecited, never crawled
  4. 4
    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
  5. 5
    Caliber Corner
    https://calibercorner.com/sellita-caliber-sw500/
    curated dbtier 2retrieved 2026-08-241 fact on this pagecited, never crawled
  6. 6
    Caliber Corner
    https://calibercorner.com/eta-valjoux-caliber-7750/
    curated dbtier 2retrieved 2026-08-241 fact on this pagecited, never crawled
  7. 7
    Internet Archive
    https://web.archive.org/web/20181106092340/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&Alfred_Rochat_7750
    archivetier 2retrieved 2018-11-061 fact on this page
  8. 8
    Internet Archive
    https://web.archive.org/web/20230905221303/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&BM_13750&
    archivetier 2retrieved 2023-09-051 fact on this page
  9. 9
    Internet Archive
    https://web.archive.org/web/20181106135001/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&Dugena_4002
    archivetier 2retrieved 2018-11-061 fact on this page
  10. 10
    Internet Archive
    https://web.archive.org/web/20181107150926/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&Fortis_2001
    archivetier 2retrieved 2018-11-071 fact on this page
  11. 11
    Internet Archive
    https://web.archive.org/web/20181107172737/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&IWC_790
    archivetier 2retrieved 2018-11-071 fact on this page
  12. 12
    Internet Archive
    https://web.archive.org/web/20171030230312/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&129&2uswk&Junghans_688_11
    archivetier 2retrieved 2017-10-301 fact on this page
  13. 13
    Internet Archive
    https://web.archive.org/web/20230901185932/http://ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Omega_1150
    archivetier 2retrieved 2023-09-011 fact on this page
  14. 14
    Internet Archive
    https://web.archive.org/web/20230901185941/http://ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Omega_1151
    archivetier 2retrieved 2023-09-011 fact on this page
  15. 15
    Internet Archive
    https://web.archive.org/web/20230901185951/http://ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Omega_1152
    archivetier 2retrieved 2023-09-011 fact on this page
  16. 16
    Internet Archive
    https://web.archive.org/web/20230901190007/http://ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Omega_1154
    archivetier 2retrieved 2023-09-011 fact on this page
  17. 17
    Internet Archive
    https://web.archive.org/web/20230901190119/http://ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Omega_1155
    archivetier 2retrieved 2023-09-011 fact on this page
  18. 18
    Internet Archive
    https://web.archive.org/web/20230901190233/http://ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Omega_1156
    archivetier 2retrieved 2023-09-011 fact on this page
  19. 19
    Internet Archive
    https://web.archive.org/web/20230901190247/http://ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Omega_1158
    archivetier 2retrieved 2023-09-011 fact on this page
  20. 20
    Internet Archive
    https://web.archive.org/web/20171031005826/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&155&2uswk&Omega_1164
    archivetier 2retrieved 2017-10-311 fact on this page
  21. 21
    Internet Archive
    https://web.archive.org/web/20181108071335/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&Tissot_2060
    archivetier 2retrieved 2018-11-081 fact on this page
  22. 22
    Internet Archive
    https://web.archive.org/web/20230902010954/http://ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Valjoux_7758
    archivetier 2retrieved 2023-09-021 fact on this page
  23. 23
    Internet Archive
    https://web.archive.org/web/20230902011016/http://ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Valjoux_7770
    archivetier 2retrieved 2023-09-021 fact on this page