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Seiko Monster Automatic 200M
Ref. SRP315J1 · Diver
Stock unknown
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Case
- Diameter
- 42mm
- Material
- Stainless Steel
- Finish
- Brushed and Polished
- Water resistance
- 200m
- Caseback
- Solid
Crystal & dial
- Crystal
- Hardlex
- Shape
- Flat
- Dial color
- Orange
- Indices
- Applied
Movement
- Caliber
- Seiko 4R36
- Type
- Automatic
- Beat rate
- 21,600 vph
- Power reserve
- 41h
- Jewels
- 24
Seiko
Seiko's day-date automatic caliber and the in-house branded version of the NH36 with stricter quality control and finishing. The additional day wheel over the 4R35 adds the day-of-week complication without changing the movement dimensions. Found extensively in the Seiko 5 Sports and Prospex lines, it offers Seiko's proven reliability with the convenience of day-date display at a mainstream price point.
Monster collection · 2 watches
Market
RetailNot listed
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Active listings1Across watch forums
Closed · 90d0Asking-price history
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Retail stock & market context
Seiko on the secondhand market
+10.1%
2026 so far · +5.2% to +17.0% · 103 matched watches
In line with the index
Divers as a group: +6.1% · 368 matched watches
Year-by-year readings →Similar watches
Community
Owners widely praise the Seiko Monster Automatic 200M for its excellent Lumibrite, reliable performance, and comfortable wearability, with many considering it a bargain. Reviewers and owners alike highlight the watch's robust build and iconic design elements, such as the distinctive bezel grip. Some owners note the rubber strap can be stiff or long, and one owner reported minor time adjustments every few weeks over a decade of daily wear. Overall, owners and reviewers rate the Seiko Monster Automatic 200M highly for its exceptional value and enduring appeal.
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