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

Family tree · none recorded

No lineage link to any other caliber is recorded for this design under the Heritage profile. That is a gap in the research, not a claim that none exists.

Open the full family view →

movement

Citizen 7270

Citizen Watch Co., Ltd.archive filingintroduced 1969design:citizen-7270compare specs
bounding evidence — no range is drawn on the era axis
not after 1971
a dated example movement, 1971“1971: K, K, Citizen, Japan, 21 J.; Parashock”
not after 1971
a dated example movement, 1971“1971: K, K, Citizen, Japan, 21 J.; Parashock”
not after 1971
a dated example movement, 1971“1971: K, K, Citizen, Japan, 21 J.; Parashock”
not after 1971
a dated example movement, 1971“1971: K, K, Citizen, Japan, 21 J.; Parashock”
not after 1971
a dated example movement, 1971“1971: K, K, Citizen, Japan, 21 J.; Parashock”
not after 1971
a dated example movement, 1971“1971: K, K, Citizen, Japan, 21 J.; Parashock”
not after 1971
a dated example movement, 1971“1971: K, K, Citizen, Japan, 21 J.; Parashock”
not after 1971
a dated example movement, 1971“1971: K, K, Citizen, Japan, 21 J.; Parashock”
not after 1971
a dated example movement, 1971“1971: K, K, Citizen, Japan, 21 J.; Parashock”
not after 1971
a dated example movement, 1971“1971: K, K, Citizen, Japan, 21 J.; Parashock”
not after 1971
a dated example movement, 1971“1971: K, K, Citizen, Japan, 21 J.; Parashock”

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
Citizen 7270
movementproducer: Citizen Watch Co., Ltd.archive filing
IIDesignations — 0 names

No designation is recorded for this design yet.

IIIExecutions — 1 article

No source in this corpus states which grade any Citizen 7270 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:citizen-7270/unknown

Specifications

PropertyValueScopeStatusSources
Jewels
build.jewel_count
21—accepted
Jewels
build.jewel_count
21Ranfft data sheet, the 21-jewel member of its 21/23/25 rangeaccepted
Jewels
build.jewel_count
23Ranfft data sheet, the 23-jewel member of its 21/23/25 rangeaccepted
Jewels
build.jewel_count
25Ranfft data sheet, the 25-jewel member of its 21/23/25 rangeaccepted
Date correction
disp.date_quickset
crown—staged
Date
disp.has_date
yes—staged
Day
disp.has_day
yes—staged
Seconds display
disp.seconds_display
central—staged
Lift angle
esc.lift_angle_deg
46 deg—accepted
Casing diameter
geom.casing_diameter_mm
28.4 mm—staged
Movement diameter
geom.diameter_mm
28 mm—accepted
Movement diameter
geom.diameter_mm
28.05 mm—accepted
Movement height
geom.height_mm
4.84 mm—accepted
Movement height
geom.height_mm
4.8 mm—accepted
Frequency
osc.frequency_vph
21600 vph—accepted
Shock protection
osc.shock_protection
parashockexample movement, 1971staged
Power reserve (typical)
power.reserve_typical_h
41 h—accepted
Introduced
prod.intro_year
1969—staged
Hacking seconds
wind.has_hacking_seconds
no—accepted
Quickset date
wind.has_quickset_date
yes—accepted
Winding mode
wind.mode
automatic—accepted
Rotor bearing
wind.rotor_bearing
ball_bearing—accepted

Where a property carries more than one value, the values have different scopes — an official spec sheet and observed hardware, say. Different scopes are not a disagreement, so both are accepted and both are shown with the scope they apply to.

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 · 0

Where this construction came from. Read up the arrows.

None recorded. An absence here means no source stated one, not that none exists.

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.

Curated family labels

Citizen family/generations block
authority: ranfft7 members

Sources

  1. 1
    Internet Archive
    https://web.archive.org/web/20230906120349/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Citizen_7270&
    archivetier 2retrieved 2023-09-0618 facts on this page
  2. 2
    Caliber Corner
    https://calibercorner.com/citizen-caliber-7270
    curated dbtier 2retrieved 2026-09-0810 facts on this pagecited, never crawled
  3. 3
    Internet Archive
    https://web.archive.org/web/20220818232021/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Citizen_7200
    archivetier 2retrieved 2022-08-182 facts on this page
  4. 4
    Internet Archive
    https://web.archive.org/web/20230906120153/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Citizen_7230&
    archivetier 2retrieved 2023-09-061 fact on this page
  5. 5
    Internet Archive
    https://web.archive.org/web/20230906120647/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Citizen_7450&
    archivetier 2retrieved 2023-09-061 fact on this page
  6. 6
    Internet Archive
    https://web.archive.org/web/20230830155224/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?03&ranfft&0&2uswk&Citizen_7220
    archivetier 2retrieved 2023-08-301 fact on this page
  7. 7
    Internet Archive
    https://web.archive.org/web/20230830155503/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?03&ranfft&0&2uswk&Citizen_7620
    archivetier 2retrieved 2023-08-301 fact on this page
  8. 8
    Internet Archive
    https://web.archive.org/web/20230830010123/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?02&ranfft&0&2uswk&Citizen_7280
    archivetier 2retrieved 2023-08-301 fact on this page
  9. 9
    Internet Archive
    https://web.archive.org/web/20230830155604/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?03&ranfft&0&2uswk&Citizen_7760
    archivetier 2retrieved 2023-08-301 fact on this page
  10. 10
    Internet Archive
    https://web.archive.org/web/20230830155535/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?03&ranfft&0&2uswk&Citizen_7710
    archivetier 2retrieved 2023-08-301 fact on this page
  11. 11
    Internet Archive
    https://web.archive.org/web/20181106123137/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&Citizen_7290
    archivetier 2retrieved 2018-11-061 fact on this page
  12. 12
    Internet Archive
    https://web.archive.org/web/20230830155511/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?03&ranfft&0&2uswk&Citizen_7700
    archivetier 2retrieved 2023-08-301 fact on this page
  13. 13
    Internet Archive
    https://web.archive.org/web/20191021023832/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&Citizen_7610
    archivetier 2retrieved 2019-10-211 fact on this page
  14. 14
    Internet Archive
    https://web.archive.org/web/20230830155213/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?03&ranfft&0&2uswk&Citizen_7210
    archivetier 2retrieved 2023-08-301 fact on this page