Cases

Both. Path A modifies an existing Seiko (cheaper, more disassembly). Path B builds from scratch on an LA case (full design freedom, simpler assembly). New modders usually start with Path A; experienced modders move to Path B.

The range runs from 33mm to 42mm. The heart of the line sits at 36mm — the size most of our platforms are built on — with 33mm and 34mm for smaller wrists, 38mm and 39mm in between, and a 42mm SKX007-family diver at the top. Each product page lists the case's exact dimensions, including thickness and lug-to-lug.

NH35 if you want a date. NH36 if you want a day-date. NH38 for a clean no-date or open-heart dial. NH34 for a GMT travel watch. NH70/71/72 are skeletal. All share the same Type M architecture and are interchangeable across the Lucius Atelier smaller-case lineup.

The Lucius Atelier Bauhaus 33mm Ultra Thin Edition is the thinnest NH-compatible Seiko mod case on the market at 9.93mm with a solid case back. The rest of the Ultra Thin lineup sits close behind — Seikonaut 38mm at 10.0mm, SKX013 Diver 38 at 10.86mm, Pilot 34mm at 10.96mm, even the NH34 GMT-ready 1908 36mm at 10.75mm. For context, most Seiko mod cases on the market run 13–14mm thick. The Ultra Thin programme is an engineering effort to push the floor below 10mm while remaining NH-compatible.

Smaller cases (33–38mm) wear better on most wrists, slip under a shirt cuff, and let dial designs read at correct proportions. The LA smaller-case lineup spans seven cases from 33mm Bauhaus to 38mm SKX013 Diver, every one Ultra Thin Edition.