Sellita · Sellita SW200-1

Oris Aquis, Christopher Ward C60 and Sinn 556 power reserve: inside the Sellita SW200-1

The Oris Aquis Date, Christopher Ward C60 Trident Pro 300, Sinn 556 and hundreds of other Swiss automatics run on the Sellita SW200-1. From full it lasts about 38 hours, a little over a day and a half.

Updated September 2026 · Based on manufacturer specs, published reviews and watchmaker/owner reports

Watches that use the Sellita SW200-1

If a Swiss automatic from outside Swatch Group shows hours, minutes, central seconds and a date, and costs less than a luxury brand's in-house piece, there's a good chance an SW200-1 is inside. Brands often rename it: Oris calls its version the Caliber 733, Tudor the T600 and T601, and TAG Heuer's Calibre 5 is either an SW200-1 or an ETA 2824-2 depending on the batch. The table covers the watches people search for most.

Specs at a glance

History and where it came from

Sellita was founded in La Chaux-de-Fonds in 1950 and spent decades assembling movements for ETA under contract. When the 2824's patents expired and Swatch Group began cutting ETA supplies to outside brands in the early 2000s, Sellita started making its own version with parts sourced outside the group. The first SW200 appeared around 2003, and the SW200-1 followed in 2008 with revised parts, mainly in the winding system.

Today it's one of the most-produced Swiss automatics, and most of the non-Swatch watches that once had a 2824-2 now have an SW200-1. That's why an Oris Aquis, a Christopher Ward C60 or a Sinn 556 all feel alike when you wind and set them. Inside Swatch Group, the same footprint went the other way, to the 80-hour Powermatic 80.

In 2026 Sellita announced the SW200-2 Power+, with a 65-hour reserve from a new escapement, gear train and barrel. Worn & Wound reports it drops into the same cases, but its parts don't interchange with the SW200-1, and the SW200-1 stays in production during the transition. Almost every SW200 watch on sale or on a wrist today is the 38-hour SW200-1, so that's what this page covers.

Accuracy in the real world

Sellita uses the same four grades as ETA, and the grade matters more than the name on the rotor. A Top-grade SW200-1 will beat a Standard-grade 2824-2, and at the same grade reviewers and watchmakers find the two practically identical. Brands rarely say which grade they use, though Oris, Sinn and Christopher Ward generally use better grades than the cheapest microbrands.

Owners who post timegrapher results usually report single-digit daily rates, and well-regulated examples run within a few seconds a day. Some standard-grade watches drift ±10 s/day or more, which is inside Sellita's tolerance. As a 4 Hz movement with a conventional regulator, it's quick for any watchmaker to adjust, so a watch that runs fast can usually be brought in without a full service.

Reliability and servicing

The SW200-1 is serviceable almost anywhere, and parts are easy to get because Sellita sells to the whole industry. Most sources suggest a service every three to five years. If a watchmaker decides a movement isn't worth rebuilding, a replacement is easy to source, which keeps an Oris or Christopher Ward repairable for decades.

The known weak point is the ratchet wheel. Teeth breaking off it was one of the reasons for the SW200-1 revision, and owner and watchmaker reports suggest it still happens occasionally, usually linked to heavy or frequent hand-winding.

• Symptoms: the crown slips or skips when you wind, the rotor spins freely, or the reserve drops sharply.
• The part itself is cheap, but broken teeth can end up elsewhere in the movement, so watchmakers usually recommend a full clean.
• Dirty or dry reversing wheels are the other common complaint: a rotor that spins noisily or doesn't wind well. A clean and re-oil normally fixes it.

Quirks worth knowing

• Wind gently. Unimatic's instructions say 25 to 30 turns to charge it from stopped. Do that when it has stopped, not every morning.
• Rotor noise. Some owners hear or feel the rotor spin, particularly on a lighter watch. It's normal unless it gets louder or scrapes.
• Phantom date. Some "no-date" SW200-1 watches actually use the date version with the window covered, so the crown has a setting position that does nothing. Ask the brand whether it's a true SW200-1 b if that bothers you.
• Date danger zone. As with the 2824, avoid the quickset date late in the evening. Here's why.

How it compares

• ETA 2824-2: the original, with the longer track record and the same performance at the same grade. The SW200-1 is easier for brands to buy.
• Powermatic 80: the same footprint with more than twice the reserve, but only in Swatch Group watches such as the Tissot PRX.
• Calibre SH21: Christopher Ward's own 120-hour movement, made with Synergies Horlogères. It's the upgrade inside the same brand's C60 and C63 range.
• Oris Calibre 400: Oris's in-house replacement for the 733, with 120 hours and a longer warranty.
• Sellita SW300-1: the thinner, larger-diameter sibling used in dressier watches.
• Miyota 9015: the Japanese alternative at 4 Hz with a similar reserve; cheaper and louder.

Living with the 38-hour reserve

Thirty-eight hours covers a night, not a weekend. Take your Oris Aquis off at 6pm on Friday and it will probably stop around breakfast on Sunday, even with a full spring. If it had only a day at the desk before that, it can stop on Saturday. A Christopher Ward C60 or Sinn 556 that sits out a weekend will need the time and date set on Monday.

That matters more with this movement than most, because the fix people reach for, winding it back up fully by hand every time, is exactly what strains the ratchet wheel. It's better to put the watch on before it stops than to keep reviving it with the crown. Watch Winder counts down the reserve for each watch you own and reminds you before one stops, so you know which one to wear next. To check a particular weekend, try the "Will my watch stop?" calculator.

Verdict

The SW200-1 is the reason Swiss automatics outside Swatch Group are still affordable. It performs like a 2824-2 at the same grade, any watchmaker can service it, and parts will be around for decades. Its weak spots are a short reserve and a winding system that doesn't like to be forced. Buy the watch for its grade and case, wind it gently, and don't expect it to last a weekend. If reserve is the priority, look at the Powermatic 80, the SH21, the Oris 400 or the new SW200-2.

FAQ

How long does an Oris Aquis Date run off the wrist?

Oris quotes 41 hours for the Caliber 733 in the Aquis Date, which is a Sellita SW200-1. Expect a little under two days from a full wind, and less if it was only partly wound.

What is the power reserve of the Christopher Ward C60 Trident Pro 300?

Christopher Ward quotes 38 hours for the SW200-1 versions. The Trident models with the Calibre SH21 run for about 120 hours.

Does the Sinn 556 hack and hand-wind?

Yes. The SW200-1 in the Sinn 556 stops the seconds hand when you pull the crown to set the time, and it can be wound by hand through the crown.

Why did my Oris Divers Sixty-Five stop over the weekend?

Its SW200-1-based Caliber 733 runs for about 38 to 41 hours from full, which isn't enough for Friday evening to Monday morning. A watch that wasn't fully wound will stop sooner.

Is it bad to hand-wind a Sellita SW200-1?

Occasional gentle winding is fine. Owners and watchmakers link heavy, repeated hand-winding to broken ratchet wheel teeth, so wind it when it has stopped and let wearing do the rest.

Is the Tudor 1926 movement a Sellita?

Tudor's T600 and T601 are based on either the ETA 2824-2 or the Sellita SW200-1, finished and adjusted by Tudor. Both run about 38 hours.

What's the difference between the SW200-1 and SW200-2?

The SW200-2 Power+, announced in 2026, has a 65-hour reserve thanks to a new barrel, gear train and escapement. It fits the same cases, but its parts don't interchange with the SW200-1.

Sources

• Oris: Aquis Date 01 733 7766 product page
• Unimatic: Sellita SW200-1 a specifications and instructions
• Worn & Wound: Sellita introduces the SW200-2 with 65-hour power reserve
• Rescapement: Five great watches with Sellita SW200 movements
• Rotate Watches: Sellita SW200, the ETA 2824 alternative

Keeping it running

• On an average day an automatic gains roughly 4 hours of reserve per hour on the wrist, so about 10 hours of wear fills the Sellita SW200-1. Desk days charge more slowly.
• Most automatics can also be wound by the crown. If yours has stopped, a few dozen turns gets it going before you put it on.
• Off the wrist it stops about 38 hours after it was last full. Stopped sooner?
• On a watch winder, start at about 650 turns per day, both directions. Winder settings for every movement.
• If it does stop, don't set the date between 9pm and 3am. Check if it's safe.

All Sellita movements

Never let it stop

Watch Winder counts down the reserve of every watch you own and reminds you before one stops. It already knows the Sellita SW200-1: type your watch's name and the reserve fills itself in.

Manufacturer's published figure. Real reserve varies with the watch's age and service; check your manual.