WHICH WATCH FITS

Citizen Radio-Controlled Moonphase

Citizen

Citizen Radio-Controlled Moonphase

Citizen Radio-Controlled Moonphase (reference BY1030-09A) — specifications, measurements, watch images and standardized wrist-fit previews for informed comparison.

A 42 mm complication watch with quartz movement and 100 m water resistance.

Add to comparisonBack to comparison table
Best forWearers seeking a versatile watch for regular use.
Not ideal forBuyers who need a different size, complication set or strap format.

At a glance

ReferenceBY1030-09A
Model lineRadio-Controlled Moonphase
Production statusunknown
Watch technology InfoQuartz
DisplayAnalog
Movement InfoQuartz
Key features InfoMoon phase, Radio time sync
Case diameter Info42 mm
Thickness Info10.7 mm
Water resistance100 m
OriginJapan
Price categoryPremium

Interactive position & score profile

Watch Radar and scores

See where this reference sits among the full WhichWatchFits database. Change the axes, hover or tap another watch, and open its detail page without changing this page URL.

Compare this watch
Loading Watch Radar…

Related references

Similar watches to explore

Each watch below includes the main reasons it is related. Use “Find alternatives” above when you want to rank by one specific priority.

See sources

Manufacturer and technical references used to verify this watch specification.

Specifications last verified: 2026-08-03.

Compare before choosing

Measurements tell only part of the story. Compare this watch with other selected references on the same standard wrist.

Back to comparison table