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Seiko SKX013 Specifications
| Reference | SKX013K2 |
|---|---|
| Case Size | 38mm |
| Lug Width | 20mm |
| Lug-to-Lug | 44mm |
| Thickness | 13.4mm |
| Case Material | stainless steel |
| Crystal | Hardlex |
| Water Resistance | 200m |
| Movement | 7S26 (automatic) |
| Bezel | rotating dive bezel |
| Crown | screw-down |
| Case Back | screw-down |
| Price Range | $250-$500 (secondhand) |
Compatible Straps for the Seiko SKX013
The SKX013 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 | Barton | Water-resistant, comfortable for daily wear | $15–$80 | |
| jubilee bracelet | Crafter Blue | Classic bracelet style, comfortable links | $15–$80 | |
| oyster bracelet | Uncle Seiko | Sporty bracelet, solid end links available | $15–$80 | |
| leather | Archer | Dresses up the watch, fits 20mm lugs | $15–$80 | |
| perlon | Strapcode | Lightweight, breathable, adjustable fit | $15–$80 |
Replacement Parts for the Seiko SKX013
| Part | Description | Compatibility Note |
|---|---|---|
| crystal (Hardlex or sapphire upgrade) | Protective cover over the dial | Fits 38mm case |
| bezel insert | Outer ring marking | Matches rotating dive bezel configuration |
| chapter ring | Inner ring with minute markings | Specific to 38mm case |
| 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 SKX013
The SKX013 is a popular platform for modding. Here are the most common modifications.
- bezel insert — Swap the stock bezel insert for a ceramic, lumed, or differently colored option.
- crystal upgrade to sapphire — Upgrade the stock mineral/Hardlex crystal to a scratch-resistant sapphire crystal.
- chapter ring — Replace with a contrasting or lumed chapter ring for improved readability.
- dial swap — Install an aftermarket dial for a completely new look.
- movement upgrade to NH36 — Swap to an upgraded movement for hand-winding and hacking capability.
Frequently Asked Questions
What lug width is the Seiko SKX013?
The Seiko SKX013 has a 20mm lug width, which is 2mm narrower than the SKX007/009.
Is the SKX013 the same as the SKX007?
The SKX013 is a mid-size version of the SKX007. It has a 38mm case (vs 42.5mm) and 20mm lug width (vs 22mm). The movement and design are the same.
Can I use SKX007 parts on an SKX013?
Some parts like the movement and crown are interchangeable. However, bezels, bezel inserts, crystals, and straps differ due to the smaller case size.