Sellita vs Miyota: What's the Difference and Does It Matter?

May 5, 2026

Most independent watch brands in the £300–£2,000 range use one of these two movements. Farer, Christopher Ward, Sinn, Oris, and Yema use Sellita. Lorier, Unimatic, and Baltic use Miyota. Zelos uses Seiko's NH35A for most models and Miyota for the Spearfish GMT. The question every buyer asks: is one better than the other?

The short answer is that both are reliable workhorse movements that will serve you well for years. The longer answer involves some real differences in how they feel, how they perform, and what they cost the brands using them.

The Movements

Sellita SW200-1

The Sellita SW200-1 is the Swiss workhorse. It's a functional equivalent of the ETA 2824-2 — same dimensions, same specs, same compatibility with ETA parts. Sellita developed it after Swatch Group (ETA's parent company) began restricting ETA movement sales to non-Swatch brands. Virtually every Swiss brand outside the Swatch Group now uses Sellita as their base automatic.

Available in three grades: Standard, Elaboré (most common), and Top (adjusted in five positions, used by Sinn among others). The higher grades are regulated more tightly at the factory and tend to run more accurately out of the box.

Hacking (seconds hand stops when you pull the crown) and hand-winding are standard. Day-date variant is the SW220. GMT variant is the SW330.

Miyota 9039 / 90S5

The Miyota 9-series is the Japanese equivalent — a reliable automatic that costs less than a Sellita and performs similarly in daily use. The 9039 is a no-date calibre (used by Baltic, Unimatic). The 90S5 is the date variant (used by Lorier). Both hack and hand-wind.

The 9-series replaced the older Miyota 82xx series, which didn't hack or hand-wind. This was the upgrade that made Miyota movements viable for serious watches.

42-hour power reserve vs Sellita's 38 gives the Miyota a slight edge on paper, though the difference in real-world use is negligible.

Seiko NH35A / 4R36

Including this because it appears across the microbrand space (Zelos, Unimatic divers). The NH35A is cheaper than both Sellita and Miyota 9-series, and it shows in the specs. Lower beat rate (3Hz vs 4Hz — the seconds hand ticks in slightly less smooth increments), wider accuracy tolerance, and less refined finishing. But it's robust, easy to service, and hacks and hand-winds.

The Real Differences

Beat Rate and Smoothness

Sellita and Miyota 9-series both run at 28,800 bph (4Hz) — the seconds hand sweeps in eight increments per second. The Seiko NH35A runs at 21,600 bph (3Hz) — six increments. On paper, 4Hz looks smoother. In practice, you'd struggle to tell the difference without staring at the seconds hand. But some people care, and 4Hz is objectively better.

Accuracy

Sellita at Elaboré grade is spec'd at ±7 to ±20 sec/day (symmetric tolerance). Miyota 9-series at -10/+30 sec/day. Seiko NH35A at -20/+40 sec/day. The Miyota and Seiko tolerances are asymmetric — they allow more gaining than losing.

In practice, most well-regulated examples of all three run within ±5–10 sec/day regardless of spec. The factory tolerance is the worst case, not the typical case. Brands like Sinn (Top grade Sellita) regulate their watches after assembly, which tightens the accuracy beyond the movement's factory spec. Many microbrands also perform final regulation, though practices vary.

The real accuracy difference is between individual examples, not between movement families.

Finishing

Here's where the gap exists. Open the caseback on a Sellita-powered Farer and you'll see perlage, Côtes de Genève striping, and blued screws (depending on grade). Flip over a Miyota-powered Baltic MR and the display caseback shows a functional, industrial movement with minimal decoration.

This matters to some people. If you want a display caseback worth looking at, Sellita-powered watches generally offer better movement finishing. If you never flip the watch over, you'll never notice.

Serviceability

Both Sellita and Miyota 9-series are widely serviceable by independent watchmakers. Parts are readily available. Service costs are similar (£100–£250 depending on the watchmaker and what's needed). The Seiko NH35A is arguably the easiest to service — parts are the cheapest and most widely available.

Cost to the Brand

Sellita movements cost brands significantly more than Miyota. This is reflected in retail pricing: Sellita-powered watches (Farer, CW, Sinn) start around £650–£800. Miyota-powered watches (Lorier, Baltic) start around £350–£500.

The movement cost difference is one reason Lorier can offer a Neptune with bracelet for £470 while Farer charges £800+ for a field watch on a strap. It's not the only reason (Swiss assembly, different materials, different overheads), but it's a meaningful factor.

Which Should You Buy?

Buy a Sellita-powered watch if: You want Swiss-made on the dial. You value movement finishing visible through a display caseback. You're buying from Farer, CW, Sinn, Oris, or Yema.

Buy a Miyota-powered watch if: You want to spend less for comparable reliability. You don't care about movement decoration. You're buying from Lorier, Baltic, or Unimatic.

Buy an NH35A-powered watch if: You want the cheapest entry point. You're buying from Zelos or entry-level Unimatic.

The truth: For day-to-day wearing, all three are fine. You'll set the time, wear the watch, and it'll keep running for years. The differences matter most to people who care about what's inside — and if you're reading a 900-word article about movements, that's probably you. In that case, Sellita at Top grade is the best option and Miyota 9039 is the best value.

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