Photo by Aditya Sethia on Unsplash
Seiko
Prospex Alpinist
DiveAffordable & Microbrand
$900
A field/dive hybrid design descended from Seiko's first Alpinist mountaineering watch of 1959.
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- Collection
- Prospex
- Reference number
- SPB507J1
- Case material
- Stainless steel
- Case diameter
- 39.5 mm
- Case thickness
- 12.7 mm
- Lug width
- 20 mm
- Lug-to-lug
- 46.4 mm
- Movement
- Automatic
- Caliber
- 6R55
- Water resistance
- 200 m
- Power reserve
- 72 hours
- Release year
- 2025
- Country of origin
- Japan
Wrist size visualizer
Case diameter and lug-to-lug drawn to scale (4px per mm) against a millimeter ruler — hold a ruler or tape measure up to the screen to compare.
mm circumference
Lug-to-lug (46.4mm) is approximately 86% of your estimated flat wrist width (54mm). Well-proportioned for your wrist.
Price History
Up 71.4% ($375) since 10/3/2026.
Low $525 · High $900
- 10/5/2026$900▲ $375
- 10/3/2026$525
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