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Calibre 6R54
![](https://www.seikowatches.com/nz-en/-/media/Images/GlobalEn/Seiko/Home/products/prospex/spb377_379/SPB377J1_01.png?mh=1125&mw=2000&hash=0A3849FCBF249A7DAAB6C54E78DF7367)
The new Calibre 6R54, which has a power reserve of three full days, powers the new Seiko Prospex Alpinist Mechanical GMT.
High legibility
![](https://www.seikowatches.com/nz-en/-/media/Images/GlobalEn/Seiko/Home/products/prospex/spb377_379/SPB377J1_02.png?mh=1125&mw=2000&hash=D31967852CC13077E535565D95F753BB)
The 24-hour display on the bezel and the 24-hour hand with red tip guarantee the legibility of the GMT function.
Specifications
Movement
- Caliber Number
- 6R54
- Movement Type
- Automatic with manual winding
- Accuracy
- +25 to -15 seconds per day
- Duration
- Approx. 72 hours(3 days)
- Jewels
- 24
- Functions
-
- 24-hour hand (dual time display function)
- Stop second hand function
Case/Band
- Case Material
- Stainless steel (super hard coating)
- Case Size
-
Thickness:13.6mm
Diameter:39.5mm
Lug-to-lug:46.4mm - Crystal
- Curved sapphire crystal
- Crystal Coating
- Anti-reflective coating on inner surface
- LumiBrite
- Lumibrite on hands and index(es)
- Band Material
- Cow Steer
- Clasp
- Three-fold clasp with push button release
- Lug width
- 20
Other Details
- Water Resistance
- 20 bar
- Magnetic Reluctance
- 4,800 A/m
- Features
-
- See-through case back
- Screw-down crown
- See-through & Screw case back