Family treeSellita SW500 — Heritage family: 26 calibers, 25 sourced lineage links.Drag to explore.

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accepteddisputed

Sense of “family”Heritage · 26Everything (debug) · 26 Parts cluster (Jules Borel sense) · 1 Manufacturer-internal (Ranfft sense) · 1 Based-on star (WatchBase sense) · 26 Open the full family view →

movement

Sellita SW500

Sellita Watch Co S.A.introduced 2009design:sellita-sw500compare specs · 4

bounding evidence — no range is drawn on the era axis

not before 1969

Valjoux 7733 · introduced 1969 (sourced)you cannot clone what does not exist · ← clone of · ← variant of · rule IR-3 · depth 2 · 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

Sellita SW500

movementproducer: Sellita Watch Co S.A.

IIDesignations — 2 names

Issuer	Name	Kind	Disambiguated by	Sources
IWC Schaffhausen	75320	house	—
Sellita Watch Co S.A.	SW500	catalog	—

IIIExecutions — 4 articles

unknown

evidence: unknownunder a designationmodified by IWC Schaffhausen75320

exec:iwc/75320

Elaboré

evidence: maker datasheet

Tolerances for this caliber at this grade

Measured: bench uncased
Positions adjusted: 3
Positions: CH,6H,9H
Mean rate, centre: 5 s/d
Mean rate, tolerance: ± 5 s/d
Max divergence: 20 s/d
Isochronism: 15 s/d
Beat error, max: 0.6 ms
Amplitude, min: 200°
Amplitude, max: 310°
Power reserve, min: 56 h
Power reserve, typical: 62 h
Lift angle: 50°
Sampling: lot 95pct

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.

Components changed at this grade

balance staff → Epilamé Epilamisiert Epilame-coated
balance wheel → Nickel gilt
balance wheel → Nickel doré Nickel vergoldet Nickel gilt
collet → Nivatronic
escape wheel treatment → Polie, épilamée, MoS2 Poliert, epilamisiert, MoS2 Polished, epilame-coated, MoS2
pallet fork → Polie Poliert Polished
shock absorber → Incabloc

exec:sellita-sw500/elabore

Top

evidence: maker datasheet

Tolerances for this caliber at this grade

Measured: bench uncased
Positions adjusted: 5
Positions: CH,FH,6H,9H,3H
Mean rate, centre: 4 s/d
Mean rate, tolerance: ± 4 s/d
Max divergence: 15 s/d
Isochronism: 10 s/d
Beat error, max: 0.6 ms
Amplitude, min: 200°
Amplitude, max: 310°
Power reserve, min: 56 h
Power reserve, typical: 62 h
Lift angle: 50°
Sampling: lot 95pct

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.

Components changed at this grade

balance staff → Epilamé Epilamisiert Epilame-coated
balance wheel → Glucydur gilt
balance wheel → Glucydur doré Glucydur vergoldet Glucydur gilt
collet → Nivatronic
escape wheel treatment → Polie, épilamée, MoS2 Poliert, epilamisiert, MoS2 Polished, epilame-coated, MoS2
pallet fork → Polie Poliert Polished
shock absorber → Incabloc

exec:sellita-sw500/top

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:sellita-sw500/unknown

Specifications

Property	Value	Scope	Status
Jewels build.jewel_count	25	—	accepted
Lift angle esc.lift_angle_deg	50 deg	—	accepted
Movement diameter geom.diameter_mm	30 mm	—	accepted
Movement height geom.height_mm	7.9 mm	—	accepted
Swiss movement origin.swiss_movement	yes	—	accepted
Frequency osc.frequency_vph	28800 vph	—	accepted
Power reserve (minimum) power.reserve_min_h	56 h	—	accepted
Power reserve (typical) power.reserve_typical_h	62 h	—	accepted
Introduced prod.intro_year	2009	—	accepted
Hacking seconds wind.has_hacking_seconds	yes	—	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.

Ancestors · 3

Where this construction came from. Read up the arrows.

Valjoux / ETA 7750
clone of
Valjoux 7733
clone ofvariant ofdepth 2
Venus 188 / Valjoux 7730
clone ofvariant ofderived fromdepth 3

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

models

brands

grade unknown

grain 1 family · 11 model · 26 reference — the count above mixes levels. A family record is one the source states a movement for family-wide; a reference record is one case reference. They are not the same unit and are never summed silently.

IWC Schaffhausen13 models · supplier not named by the brandmodel:iwc/iw391007 model:iwc/iw391008 model:iwc/iw391009 model:iwc/iw391010 model:iwc/iw391015 model:iwc/iw391016 model:iwc/iw391019 model:iwc/iw391020 model:iwc/iw391021 model:iwc/iw391022 model:iwc/iw391035 model:iwc/iw391036 model:iwc/iw391037
Sinn13 modelsmodel:sinn/356-020 model:sinn/356-070 model:sinn/356-072 model:sinn/356-0721 model:sinn/356-0752 model:sinn/358-060 model:sinn/358-064 model:sinn/358-065 model:sinn/6099-011 model:sinn/900-011 model:sinn/900-020 model:sinn/903-041 model:sinn/903-042
Bremont2 modelsmodel:bremont/supernova-chronograph model:bremont/terra-nova-hrr-chronograph
Maurice Lacroix2 modelsmodel:maurice-lacroix/aikon-automatic-chronograph-titanium model:maurice-lacroix/pontos-chronograph
Norqain2 modelsmodel:norqain/adventure-chrono-41mm-nhl model:norqain/adventure-sport-chrono-day-date-41-steel-gold
Alpina1 modelmodel:alpina/alpiner-4-chronograph
Delma1 modelmodel:delma/montego-chronograph-black-editions
Edox1 modelmodel:edox/co-1-carbon-chronograph-automatic
Junghans1 modelmodel:junghans/1972-competition-fis-edition-lemon
Montblanc1 modelmodel:montblanc/1858-geosphere-chronograph-0-oxygen
TAG Heuer1 modelmodel:tag-heuer/formula-1-automatic-chronograph-x-gulf

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
Caliber Corner
https://calibercorner.com/sellita-caliber-sw500/
curated dbtier 2retrieved 2026-08-245 facts on this pagecited, never crawled
2
Sellita SA
https://www.sellita.ch/scripts/calibres/images/DocTec_SW500.pdf
manufacturertier 1retrieved 2026-08-2420 facts on this page
3
Caliber Corner
https://calibercorner.com/sellita-caliber-sw500
curated dbtier 2retrieved 2026-09-086 facts on this pagecited, never crawled
4
Monochrome Watches
https://monochrome-watches.com/valjoux-7750-chronograph-history-50-years-technical-explanation-evolution-clones-in-depth-review/
presstier 2retrieved 2026-08-258 facts on this page
5
analogshift.com
https://analogshift.com/products/iwc-portofino-chronograph-as07274
presstier 2retrieved 2026-09-011 fact on this page
6
Worn & Wound
https://wornandwound.com/chronography-13-the-important-history-of-the-valjoux-7730-a-classic-mid-century-movement/
presstier 2retrieved 2026-08-251 fact on this page
7
Caliber Corner
https://calibercorner.com/hamilton-caliber-h31/
curated dbtier 2retrieved 2026-08-241 fact on this pagecited, never crawled
8
WatchBase
https://watchbase.com/hamilton/caliber/h-31
archivetier 3retrieved 2026-08-241 fact on this pagecited, never crawled
9
Caliber Corner
https://calibercorner.com/eta-valjoux-caliber-7750/
curated dbtier 2retrieved 2026-08-241 fact on this pagecited, never crawled
10
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
11
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
12
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
13
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
14
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
15
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
16
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
17
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
18
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
19
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
20
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
21
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
22
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
23
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
24
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
25
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
26
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