Seiko · Prospex
Seiko Prospex 1968 Heritage Diver’s GMT SPB519J1 (reference SPB519J1) — specifications, measurements, watch images and standardized wrist-fit previews for informed comparison.
A robust 42 mm mechanical diver’s GMT with a 72-hour reserve, 300 m water resistance and Seiko’s updated adjustable clasp.
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Strengths and considerations
Strengths
- 300 m diver rating
- 72-hour reserve
- GMT function
- Ceramic bezel
- Adjustable clasp
Considerations
- Heavy at 188 g
- Large for smaller wrists
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Manufacturer and technical references used to verify this watch specification.
Specifications last verified: 2026-08-14.
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