WHICH WATCH FITS

Seiko Alpinist GMT

Seiko · Alpinist

Seiko Alpinist GMT

Seiko Alpinist GMT (reference SPB377J1) — specifications, measurements, watch images and standardized wrist-fit previews for informed comparison.

Important gmt option around €1,350, with 39.5 mm diameter and 46.4 mm lug-to-lug.

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Best forBuyers comparing recognizable gmt watches under €5,000.
Not ideal forBuyers requiring confirmed live dealer stock or exact street pricing.
Wearsmedium

At a glance

ReferenceSPB377J1
CollectionAlpinist
Model lineAlpinist GMT
Production statusCurrent
Official size39.5
Watch technology InfoMechanical
DisplayAnalog
Movement InfoAutomatic
Calibre / operating system Info6R54
Key features InfoDate, GMT
Complication InfoGMT
Illumination InfoYes
Case diameter Info39.5 mm
Thickness Info13.6 mm
Lug-to-lug Info46.4 mm
Power reserve / runtime72 hours
Water resistance200 m
OriginJapan
Recommended wrist Info14–20 cm
Price categoryPremium

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Strengths and considerations

Strengths

  • Recognizable model; useful comparison dimensions; broadly accessible price segment.

Considerations

  • Buyers who need a different size, complication set or strap format.
See sources

Manufacturer and technical references used to verify this watch specification.

Specifications last verified: 2026-08-03.

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