RPC0001 38mm Case - Explorer Case
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If 36mm feels too small and 40mm too big, the 38mm Explorer is the middle ground — a balanced, everyday size on most wrists. It keeps the clean Explorer profile (brushed top, polished sides) with a scratch-resistant flat dial-ready sapphire crystal and a notably slim 11.4mm profile. A replaceable chapter ring (SKX007-compatible) adds room to customize, and you can drop an existing 28.5mm build straight in. Available with a plain or date-window crystal, case-only or with an Oyster, Jubilee, or President bracelet.
Quick specs
| Diameter | 38mm (without crown) |
| Lug-to-lug | 47mm |
| Thickness | 11.4mm (incl. case cover) |
| Lug width | 20mm |
| Material | 316L stainless steel |
| Finish | Steel — brushed top, polished sides |
| Crystal | Flat sapphire |
| Crown | Sterile, 1-piece stem for NH movement (6.8mm × 3.4mm) |
| Movement fit | NH movement (NH35 / NH36 standard) |
| Dial fit | 28.5mm |
The case includes:
1. Steel case (brushed top, polished sides)
2. Pre-installed flat sapphire crystal
3. Sterile crown (1-piece stem, for NH movement)
4. Silver slim case back
5. 20mm spring bars
Buying options: Two choices — crystal (No Lens / With Date Lens) and bracelet (Case Only / Oyster / Jubilee / President).
Compatibility: Built for the NH movement (NH35 / NH36) and a standard 28.5mm dial. Sterile crown, 1-piece stem for NH. Fits any 20mm strap or bracelet. See all movements.
Really love this case! Putting it together, it felt very high quality compared to a lot of the cases I've used at similar price points. The Bracelet attached extremely easily, and the threading felt nice out of the box for both the crown and caseback. Option to replace the chapter ring is great for more customization and the dimensions/thickness is on point. I also love that there is brushing on the side of the case, unlike most "explorer" style cases. This is a good blend of that explorer style and a pilot watch case.
Perfect fit and amazing quality!
I used this case for a Seiko Overlander NH36 build and it worked out great. Everything fit perfectly.
The brushed top and sides finishing looks super clean and feels solid in hand.
Really happy with how the final watch turned out. Would definitely buy again for another build!