Perpetual calendar - Zippo - Mechanical rollers

The main frame is machined from matte aluminum alloy, while the base is made from a single piece of walnut wood, retaining the natural wood grain. Brass screws serve as structural fasteners. Multiple independent digital rollers are precision-assembled, providing smooth and even rotation with uniform damping. No power is required; the date, month, and day of the week are manually adjusted using a purely mechanical structure. The rollers are etched with numbers and day-of-the-week markings, including both Chinese and English versions.

Condition and Details: Overall in good condition, with no obvious scratches or dents. Fasteners show no oxidation.