If you've read a CrownCraft product page, you've seen these codes: NH35A, NH34A, NH38A. They look like part numbers because that's exactly what they are — and understanding what they mean is the single most useful five minutes you can spend before buying an automatic watch at this price point, from us or from anyone else.
What these numbers actually are
NH35A, NH34A, and NH38A are model numbers for specific automatic watch movements (calibres) manufactured by TMI, part of the Seiko group, in Japan. They're among the most widely used mechanical movements in the affordable-to-mid-range watch industry — not because they're the cheapest option available, but because they're reliable, extremely well documented, and easy to get serviced almost anywhere in the world. A watchmaker in Barcelona, Berlin, or Bangkok will recognize an NH35A on sight and have parts for it.
Each number denotes a different function set, and each one powers a specific CrownCraft model:
NH35A — a workhorse three-hand movement with a date window. This is the movement inside DEEPMASTER, CENTRE COURT, and BELMONT — three watches with very different case designs (dive, dress, square) built on the identical proven mechanical foundation.
NH34A — adds a true GMT complication: a fourth hand that independently tracks a second time zone without disturbing the local time set on the main hands. This is the movement inside MERIDIAN-GMT, and it's the reason MERIDIAN-GMT is CrownCraft's flagship complication.
NH38A — a three-hand movement built with an exposed rotor/mechanism design in mind. This is the movement inside ROADSTER, where part of the movement is visible through a cutout in the dial — the "open heart" you can actually watch working.
SPEEDWAY is the one Atelier model that doesn't use an NH-series movement — it runs the VK63, a meca-quartz hybrid movement, which gets its own dedicated explainer since the mechanics are genuinely different.
Why naming the calibre is a trust signal, not just trivia
Here's the practical point for a buyer: when a brand tells you the exact calibre instead of just saying "automatic movement," that's a transparency signal you can act on. A named movement is a known quantity — you can look up its accuracy range, its typical failure points, its parts availability, and independent reviews of the calibre itself, separate from any single brand's marketing claims. An unnamed "automatic movement" could be genuinely anything, including something with no service network and no independent track record at all.
CrownCraft names the specific calibre on every Atelier product page for exactly this reason. It's the same logic behind naming sapphire crystal instead of "premium glass," or 316L steel instead of unqualified "stainless steel" — specific, checkable facts instead of marketing adjectives.
What accuracy to actually expect
All three NH-series calibres carry a working tolerance in the range of roughly -20 to +40 seconds a day. That number surprises some first-time automatic-watch owners, who sometimes assume any modern watch should be nearly perfect — but this is standard and expected for this entire class of movement, not a defect specific to CrownCraft or to NH-series calibres. Quartz movements (like the Miyota inside OCTANE and FATHOM) are dramatically more accurate, typically drifting only a few seconds a month — but that's a fundamentally different technology, not a "better" version of the same one. See our automatic-vs-quartz guide for the full comparison.
Power reserve and daily wear
NH35A, NH34A, and NH38A all carry roughly a 38–42 hour power reserve on a full wind — the standard for this movement family. Worn daily, this is a complete non-issue: normal wrist motion keeps the mainspring topped up indefinitely, and the watch simply runs. Left unworn for more than a day or two, it will stop and need a quick manual wind (roughly 20–30 turns of the crown in the winding position) plus a time and date reset before you wear it again. That's routine for any mechanical automatic, not something specific to these calibres.
The honest trade-off
None of this makes NH-series movements exotic or unusual — that's actually the point. They're the same movement family used across the wider affordable mechanical watch industry, including by well-reviewed microbrands at similar or higher price points than CrownCraft's. What you're paying for at 219–285 EUR isn't a rare or proprietary mechanism; it's a proven, serviceable, genuinely mechanical watch, built into CrownCraft's own original case and dial designs, with the movement disclosed honestly rather than hidden behind a generic label.
If you're comparing CrownCraft against another brand at a similar price, the fastest useful question to ask is simply: what movement is actually inside, and will they tell you? If the answer is a named NH-series or comparably documented calibre, you're looking at a legitimate mechanical watch. If the answer is vague, that's worth asking about before you buy.