Watch Movement

The SL28DD is a standard quartz watch movement, often used as a cost-effective and reliable engine for everyday analog timepieces. It is characterized by its "Day-Date" functionality, providing both the day of the week and the numerical date on a single dial face.

Technical Specifications

• Type: Quartz (Electronic)

• Functions: 3 Hands (Hour, Minute, Seconds), Day of the week, and Date.

• Size: Generally categorized as a 12 ligne movement (roughly 24.0mm to 25.0mm in diameter).

• Thickness: Approximately 3.7mm to 4.0mm.

• Stem Position: Usually located at the 3 o'clock position.

Key Visual Features

• Dual Calendars: The movement features two concentric rings. The outer ring displays the dates (131), and the inner ring displays the days of the week (MONSUN).

• Bilingual Option: Notice in the image that some days appear twice (e.g., two "SUN" entries, one in red). This is common in these movements to allow for a second language or a color-coded weekend indicator.

• The "220" Marking: This is likely an internal manufacturing or batch reference code printed on the date wheel, distinct from the date numerals themselves.

Maintenance & Usage

• Battery: It typically uses a standard silver oxide coin cell (such as a SR626SW or 377), which provides a lifespan of 2 to 3 years.

• Crown Positions:

  • Position 0 (Pushed in): Normal operation/running.

  • Position 1 (Half-out): Quick-set for the day and date. Turning one way changes the date; turning the other changes the day.

  • Position 2 (Fully out): Time setting (Hour and Minute hands).

This movement is a "workhorse" component, frequently found in entry-level fashion watches and brands looking for a durable, low-maintenance internal system.