Sellita SW280-1

The SW280-1 combines a date with a moon-phase display. Sellita's catalogue drawing places the date at 3 and the moon at 6; its specification gives the automatic-winding figures above. The related SW285 versions add other indications and should not be conflated with this calibre. Sellita catalogue, printed page 20.

A different timescale

The moon display represents a phase in the lunar cycle, not the position of the moon in the sky and not a second time zone. Its slow change gives the dial a different kind of information from a ticking seconds hand or the numbered day of the month. See the moon-phase guide for the underlying distinction.

Visually, a moon aperture can become the dial's main lower feature. It needs room around the lower markers and text. Adding more hands or a dense texture will not necessarily make the composition more informative; a quiet background often makes this unusual display easier to recognize.

In the atelier

Selecting a compatible moon-phase composition uses the lower moon display and the supported right-side date position. The illustrated moon is a stylized display, not an astronomical instrument or evidence of the real calibre's correction interval. The builder does not simulate its complete calendar train, setting sequence or accumulated lunar error.

The automatic rear view is also illustrative. Its decoration does not certify a finishing grade, and its reserve label is reference information rather than a measured mainspring state. No material simulation, tested casing compatibility or manufacturing-ready Sellita assembly is implied by the graphic.