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Seiko SPB185 Specifications
| Reference | SPB185, SPB185J1 |
|---|---|
| Case Size | 40.5mm |
| Lug Width | 20mm |
| Lug-to-Lug | 47mm |
| Thickness | 13.2mm |
| Case Material | stainless steel |
| Crystal | sapphire (dual-curved) |
| Water Resistance | 200m |
| Movement | 6R35 (automatic) |
| Bezel | rotating dive bezel |
| Crown | screw-down |
| Case Back | exhibition (see-through) |
| Price Range | $1,100-$1,350 |
Compatible Straps for the Seiko SPB185
The SPB185 uses a 20mm Lug Width and is compatible with the following strap types.
| Type | Recommended Brand | Why It Works | Price Range | Link |
|---|---|---|---|---|
| NATO/ZULU | Strapcode | Classic look, easy to swap, fits 20mm lugs | $15–$80 | |
| rubber/silicone | Crafter Blue | Water-resistant, comfortable for daily wear | $15–$80 | |
| oyster bracelet | Uncle Seiko | Sporty bracelet, solid end links available | $15–$80 | |
| jubilee bracelet | Barton | Classic bracelet style, comfortable links | $15–$80 | |
| leather | Archer | Dresses up the watch, fits 20mm lugs | $15–$80 |
Replacement Parts for the Seiko SPB185
| Part | Description | Compatibility Note |
|---|---|---|
| bezel insert | Outer ring marking | Matches rotating dive bezel configuration |
| crown with stem | Time-setting knob on case side | screw-down type |
| spring bars | Pins that hold the strap to the case | 20mm, 1.5mm diameter recommended |
| case back gasket | Seal that maintains water resistance | Required for 200m WR rating |
Modding the Seiko SPB185
The SPB185 is a popular platform for modding. Here are the most common modifications.
- strap swap — Upgrade to a premium aftermarket strap or metal bracelet.
- bezel insert — Swap the stock bezel insert for a ceramic, lumed, or differently colored option.
Frequently Asked Questions
What lug width is the Seiko SPB185?
The Seiko SPB185 has a 20mm lug width.
How does the SPB185 differ from the SPB143?
The SPB185 features a blue dial and blue bezel insert, while the SPB143 has a grey/charcoal dial with a black bezel. The case, movement, and dimensions are identical.
Are SPB143 parts compatible with the SPB185?
Yes. The SPB143 and SPB185 share the same case. All straps, bracelets, and bezels are interchangeable.