62GS 36mm — Ultra Thin NH34-Ready Watch Case

Yes. The 62GS 36mm is fully NH34-ready. Fitting a GMT caliber into a sub-12mm 62GS-style case is the engineering payoff of the Ultra Thin platform — and at 11.3mm with the solid caseback, this is one of the thinnest 62GS-style cases available for a GMT NH movement. Note the second-hand clearance requirement in the warning panel above.

Two architectural features set the 62GS apart: it's bezel-less — the crystal seats directly into the case top with no bezel ring — and the crown sits at 4 o'clock instead of 3. The case is also finished with a more intricate multi-surface treatment than our standard Explorer and GS cases, with polished and brushed planes meeting at sharp boundaries. Together they create the signature silhouette of the 62GS.

The solid caseback (11.3mm) is the headline build — this is the case at its thinnest. Choose sapphire (12.2mm) if you want to display the NH movement and rotor through the back. Both are rated 100m / 10 ATM.

The box shape is core to the 62GS identity — it sits proud of the case top with a raised, curved profile that catches light differently from a flat or domed crystal. Combined with the chapter ring nested inside it, the architecture creates a depth and dimension that other case-and-crystal combinations can't match.

The 62GS box sapphire is the hardest and most expensive crystal we produce — and there are two reasons. First, the bezel-less construction leaves it structurally exposed with no bezel ring around it, so we engineered the sapphire at 1.4mm thick (thicker than our standard flat sapphires) to absorb impact safely. Second, the crystal is internally cut to seat the chapter ring within the sapphire itself — the chapter ring sits inside the box, not under it. That internal precision shaping pushes manufacturing complexity well beyond a standard flat or domed sapphire. The crystal alone reflects the engineering ambition of this case.

Yes — the 62GS 36 requires an SKX013-spec chapter ring, sold separately. On this case it seats inside the box sapphire rather than below it; without it, the dial drops and the hands will not clear properly.

Any 28.5mm dial will fit. Note that the 62GS has a 4 o'clock crown position — so dial-foot orientation matters. Stock SKX007 dials are designed for a 4 o'clock crown with offset dial feet, which is a different geometry from our 3 o'clock-foot dials. Check your dial's foot positions before fitting.

Type M and Type L are Seiko's two factory hand-fitting versions of the NH series. Type L sits higher than Type M — about 0.4mm taller from base to second-hand pinion. Because of the tight clearance between hands and sapphire in Ultra Thin Edition cases, only Type M will fit. Confirm your movement type before ordering.

No — and that's the whole point of us pre-installing the sapphire for you. The chapter ring sits on top of the dial inside the case, not under the crystal, so the crystal stays where it is throughout the build. (If you ever do need to remove the sapphire — for example, to replace it — that's a workshop job we handle for you, not an at-home step.)

The choice depends on your dial, not the case — both sizes fit every Ultra Thin Edition case. If your dial has applied (raised) indices, the ultra thin chapter ring is the better choice because its slimmer profile gives the indices clearance instead of resting on top of them. If your dial is flat-printed (no applied markers), either size works. When in doubt, the ultra thin chapter ring is the safer default because it works with both dial types.

A specific size and spec used by Seiko in the SKX013 (discontinued 2019). The LA smaller-case lineup all uses this same spec, which means dozens of chapter ring designs work across every smaller case in the catalogue.

Yes — every Ultra Thin Edition case requires an SKX013-spec chapter ring, sold separately. The chapter ring seats the dial at the correct height; without it, the dial drops and the hands will not clear properly.