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Entry-tier movement · caliber Miyota 8215: Japanese automatic, 21,600bph, 42h PR, 21j; used in Bulova Marine Star; Citizen-owned Miyota; reliable mid-range movement widely used · 42h power reserve
Large case: suits wrists 7 in+ (18 cm+)
44 mm case. A bold, statement-size wear. Best suited to larger wrists where the case sits flush.

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Authentication

The Miyota 8215 is Japanese origin, not Swiss; this is correct and genuine for the Marine Star, and buyers should know what they are getting.

Known issues in the market
  • Some buyers expect Swiss movements; the Miyota 8215 is Japanese and is the correct movement for this reference.
  • The rotating bezel must engage positively at each index.
AreaWhat to checkWhat is correctRed flag
movementMiyota 8215 movement architectureMiyota 8215 movement layout visible through caseback; Japanese architecture is correct for Marine StarNon-Miyota movement in a Marine Star case; non-genuine movement swap
caseRotating bezel engagementRotating bezel clicks positively at each index positionLoose bezel with no positive engagement; worn or damaged bezel mechanism
dialMarine Star dial text"MARINE STAR" and 200m designation on dialMissing model text or incorrect depth rating; wrong reference or non-genuine dial
Common legitimate replacements
  • Bezel insert; Bulova OEM.
  • Crystal; mineral standard.
Expert resources: Bulova authorized service; Bulova Marine Star product documentation.

Authentication guide

Last reviewed June 2026

The Marine Star is Bulova's dive-category automatic, running a Miyota 8215 movement. The 200m water resistance, rotating bezel, and blue or black dial are the standard dive watch authentication points. Miyota movements are reliable and widely used; the key check is that the caseback confirms the correct caliber.

Known reproduction risks

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LOW

Not a reproduction target at current market prices.

  • Bidirectional bezel on a model that should be unidirectional
  • Caseback without 200M designation
  • Miyota movement absent or replaced with a different caliber

Dial variants by era

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EraDescriptionIdentifiers
2022 to presentBlue or black dial with applied baton indices and lume. Three-hand display. No sub-registers. Unidirectional rotating bezel. 44mm steel case.
  • "BULOVA" at 12, "MARINE STAR" below
  • Unidirectional rotating bezel with 60-minute scale
  • Applied indices with lume
  • No chronograph pushers
  • 44mm steel case at 11mm height

Service part flags

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Rotating bezel

Original: Unidirectional ratchet bezel. Should click positively with no backplay.

Replacement tells
  • Bidirectional rotation (dive spec requires unidirectional)
  • Worn ratchet with backplay
Movement (Miyota 8215)

Original: Miyota 8215 automatic, Japanese manufacture by Citizen. 21,600bph, 42-hour power reserve. Visible through caseback with Miyota identification.

Replacement tells
  • Movement without Miyota identification through caseback
  • Power reserve significantly below 38 hours from full wind

Case back markings

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2022 to present
  • Reference 98A302
  • "BULOVA" and brand identification
  • Miyota 8215 designation
  • 200M water resistance
  • Serial number

Movement tells

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  • Miyota 8215 power reserve is 42 hours. Below 36 hours from full wind needs service.
  • Seconds hand advances at 6 ticks per second (21,600bph). Irregular stepping indicates service needed.
Sources: Bulova Marine Star official specifications.

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