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Sellita watch movements

Sellita is the Swiss movement maker whose SW-series calibers are dimensioned to match the classic ETA workhorses, making them the best-known drop-in donors.

Who Sellita is

Sellita began by assembling movements for other houses and now designs and builds its own SW range. Its calibers are deliberately dimensioned to the ETA footprints, so a brand that once used an ETA movement can move to Sellita with little or no case change.

That compatibility made Sellita central to the Swiss watch industry when open ETA supply tightened, and it is why Sellita movements are the most common answer when someone needs a donor for an ETA-based watch.

The SW range against ETA

The SW200-1 matches the ETA 2824-2 at 25.6 mm by 4.6 mm. The SW300-1 matches the slim 2892-A2, the SW220-1 the day-date 2836-2, and the SW500 the Valjoux 7750 chronograph. In each case the diameter, height and stem position are built to line up with the ETA original.

Matching on paper is necessary but not sufficient. Dial-foot positions and hand fittings still have to agree, which is why each caliber has its own page here with the full footprint rather than just a headline size.

Using Sellita as a donor

For most three-hand and day-date watches built around an ETA caliber, the equivalent Sellita is the natural drop-in donor, subject to the usual checks. The fitment tool pairs each ETA footprint with the Sellita that shares it.

Where a watch uses a chronograph or a slim caliber, the matching SW500 or SW300-1 is the movement to check first, again confirming the finer fittings against the datasheet before ordering.

Related

Sources: Sellita (Wikipedia) · Movement datasheets (as cited on each caliber page)