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ETA 2824-2 vs Sellita SW200-1: are they interchangeable

Sellita built the SW200-1 as a clone of the ETA 2824-2 after ETA restricted movement supply, and the two share a footprint close enough to be treated as near drop-in equivalents.

Why they are so alike

When ETA, part of the Swatch Group, began limiting supply of its movements to outside brands, Sellita developed its own line to fill the gap. The SW200-1 mirrors the ETA 2824-2 in the ways that matter for fitting: both measure about 25.6mm in diameter, roughly 11.5 lignes, both stand around 4.6mm high, both run at 28,800 beats per hour, and both offer a date. That shared footprint is deliberate.

Because the layout follows the ETA, many parts and much of the servicing knowledge carry across, which is a large part of why the Sellita became so widely adopted.

The day-date siblings

The pattern extends to the calendar variants. The ETA 2836-2 adds a day disc to the 2824-2, and the Sellita SW220-1 is its counterpart. If your watch shows both day and day, you are comparing the 2836-2 against the SW220-1 rather than the plain date pair.

Keeping the variants straight matters, because a date-only donor will not drive a day-date dial and aperture.

Near drop-in, not guaranteed drop-in

Near drop-in means the footprint agrees, not that every last detail is identical. Before swapping, still confirm the stem height and the hand-hole sizes against the datasheet, and check the date-window position lines up with your dial. Small differences in these details are exactly what turn a same-size movement into one that will not seat your hands or show the date correctly.

Treat the two as interchangeable in principle, then verify the fine points for your specific case and dial before ordering.

Related

Sources: ETA/Sellita/Miyota/Seiko Instruments manufacturer technical sheets · Ranfft movement archive