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Movement · Sellita · automatic

Sellita SW220-1 movement

Sellita SW220-1 is an automatic movement by Sellita: 26 mm1 across, 5.05 mm1 high, 261 jewels, beating at 28,800 bph1, 41 h1 of power reserve.

Sources checked · How we source numbers
Sellita SW220-1: movement drawingSellita SW220-1, dial side, to scale: movement diameter 26 mm; casing diameter 25.6 mm; size 11½‴; height 5.05 mm; hour, minute, second hand hole Ø — (unknown).movement Ø 26casing Ø 25.611½‴ as printed · Ø 26 = 11.53‴5.05SIDE · SECTION · height 5.05Ahour, minute, second hand hole Ø —DETAIL A · 10:1
Sellita SW220-1, dial sideDrawing from data, not a photo · mm

SW220-1 at a glance

Diameter
26 mm1
Height
5.05 mm1
Jewels
261
Beat rate
28,800 bph1
Power reserve
41 h1
Accuracy
±7 s/day1
Lift angle
50°1

New to the terms? Read quartz vs automatic or watch movement types.

Setting and servicing the SW220-1

The figures a watchmaker or a timegrapher needs for the SW220-1, as Sellita prints them.

Lift angle
50°1
Accuracy (maker)
±7 s/day1Elaboré grade: 7 ±7 s/d (differs from 5 ±5 on SW300-1 and SW330-2). Positions (3) CH, 6H, 9H. Top grade 4 ±4 s/d
Positional difference
20 s/day1Elaboré grade. Top grade 15 s/d
Power reserve
41 h1
Hacking seconds
Yes1
Hand winding
Yes1
Crown turns to full wind
271

What fits the SW220-1

The figures a dial, hands or case must match for the SW220-1, as Sellita prints them.

Casing diameter
25.6 mm1

Same family at Sellita

How each differs from the SW220-1, worked out from the figures on its own page.

What can replace the SW220-1

7 calibres of the ETA 28xx and Sellita SW200 / SW300 group checked against the SW220-1: diameter, height, hand holes, date window, crown and dial feet. A verdict marked “not confirmed” lacks one of those figures for the SW220-1 or the other calibre.

Not published, so not checked in several comparisons:

  • hand holes for SW220-1, ETA 2836-2, ETA 2824-2, ETA 2892-A2, SW300-1, ETA 2893-2 and SW330-2
  • crown position for SW220-1, ETA 2836-2, ETA 2824-2, ETA 2892-A2, SW200-1, SW300-1, ETA 2893-2 and SW330-2
  • dial feet for SW220-1, ETA 2836-2, ETA 2824-2, ETA 2892-A2, SW300-1, ETA 2893-2 and SW330-2
  • date position for SW220-1, SW300-1, ETA 2893-2 and SW330-2

  1. SW220-1 → ETA 2836-2

    Drop-in· not confirmed
    • =diameterETA 2836-2’s movement diameter matches SW220-1’s casing diameter: 25.6 mm.
    • =heightSame height: 5.05 mm.

  2. SW220-1 → ETA 2824-2

    Fits with changes· not confirmed
    • =diameterETA 2824-2’s movement diameter matches SW220-1’s casing diameter: 25.6 mm.
    • ≠heightETA 2824-2 is 0.45 mm thinner (4.6 mm vs 5.05 mm): the dial and hands sit lower, so a spacer or a different stem height may be needed.

  3. SW220-1 → ETA 2892-A2

    Fits with changes· not confirmed
    • =diameterETA 2892-A2’s movement diameter matches SW220-1’s casing diameter: 25.6 mm.
    • ≠heightETA 2892-A2 is 1.45 mm thinner (3.6 mm vs 5.05 mm): the dial and hands sit lower, so a spacer or a different stem height may be needed.

  4. SW220-1 → SW200-1

    Fits with changes· not confirmed
    • =diameterSame movement diameter: 26 mm.
    • ≠heightSW200-1 is 0.45 mm thinner (4.6 mm vs 5.05 mm): the dial and hands sit lower, so a spacer or a different stem height may be needed.
    • ≠dateSW200-1 has no day wheel: a day-date dial would show an empty day window.

  5. SW220-1 → SW300-1

    Fits with changes· not confirmed
    • =diameterSame casing diameter: 25.6 mm.
    • ≠heightSW300-1 is 1.45 mm thinner (3.6 mm vs 5.05 mm): the dial and hands sit lower, so a spacer or a different stem height may be needed.
    • ≠dateSW300-1 has no day wheel: a day-date dial would show an empty day window.

  6. SW220-1 → ETA 2893-2

    Fits with changes· not confirmed
    • =diameterETA 2893-2’s movement diameter matches SW220-1’s casing diameter: 25.6 mm.
    • ≠heightETA 2893-2 is 0.95 mm thinner (4.1 mm vs 5.05 mm): the dial and hands sit lower, so a spacer or a different stem height may be needed.
    • ≠functionsETA 2893-2 adds a 24-hour hand: it needs a dial and hand set made for it.
    • ≠dateETA 2893-2 has no day wheel: a day-date dial would show an empty day window.

  7. SW220-1 → SW330-2

    Fits with changes· not confirmed
    • =diameterSame casing diameter: 25.6 mm.
    • ≠heightSW330-2 is 0.95 mm thinner (4.1 mm vs 5.05 mm): the dial and hands sit lower, so a spacer or a different stem height may be needed.
    • ≠functionsSW330-2 adds a 24-hour hand: it needs a dial and hand set made for it.
    • ≠dateSW330-2 has no day wheel: a day-date dial would show an empty day window.

All SW220-1 figures

Every figure we hold for the SW220-1, with its source. Where sources disagree, each value is shown.

Size

Size in lignes
11½‴1
Diameter
26 mm1
Casing diameter
25.6 mm1
Height
5.05 mm1

Running

Jewels
261
Beat rate
28,800 bph1
Power reserve
41 h1
Hands and functions
hours, minutes, centre seconds, date, day1
Hacking seconds
Yes1
Hand winding
Yes1
Crown turns to full wind
271

Accuracy and care

Accuracy (maker)
±7 s/day1
Positional difference
20 s/day1
Lift angle
50°1

Origin

Made in
SWISS MADE1

Not published yet

  • Hand holes: only in Sellita’s drawing; not read yet
  • Dial feet: only in Sellita’s drawing; not read yet
  • Stem part number: not in the documents we read
  • Do not set the date: not published by Sellita

SW220-1 questions

What is the lift angle of the SW220-1?

50°, as Sellita prints it. Enter 50° on a timegrapher to read amplitude correctly for the SW220-1.

Source [1]

How accurate is the SW220-1?

Sellita rates the SW220-1 at ±7 s/day, measured under Sellita’s own test conditions; a worn SW220-1 can run outside the ±7 s/day range.

Source [1]

How long does the SW220-1 run when fully wound?

About 41 h from a full wind, per Sellita; a full hand wind takes about 27 crown turns.

Source [1]

Does the SW220-1 hack and hand-wind?

Yes, it hacks: the seconds hand stops with the crown pulled out. It can be wound by the crown.

Source [1]

What can replace the SW220-1?

From the published figures, the closest is the ETA 2836-2: drop-in, not confirmed for every part. ETA 2836-2’s movement diameter matches SW220-1’s casing diameter: 25.6 mm.

More on movements

Sources

Documents checked · Report a wrong number

  1. 1SELLITA WATCH Co S.A. — Documentation technique SW 220-1 (DocTec) · pdf · read