Sinn 104 ST SA A Pilot Watch

The Watch
The case of this aviation timepiece measures 41 mm in diameter, topped by a sapphire crystal, while the transparent screw-down caseback offers a clear view of the oscillating weight inside. Crafted in stainless steel, the case is framed by a 60-minute graduated rotating bezel. The screw-down crown sits at 3 o'clock.

The Dial
Designed for aviation, the round dial features a deep black background for optimal legibility. The rectangular hour and minute hands are coated with a luminescent treatment for around-the-clock visibility. Hours are marked by baton indices paired with Arabic numerals, alongside a minutes railway track. The central seconds hand is steel and also features a luminescent coating, consistent with the rest of the dial. The date and day-of-week windows sit at 3 o'clock, while the brand name appears at 12 o'clock.

The Movement
Powering this pilot's timepiece is a Swiss-made automatic winding analog movement. The Sellita SW220-1 caliber features 26 jewels, runs at a frequency of 28,800 vibrations per hour, and delivers a 38-hour power reserve. Functions include hours, minutes, seconds, date, and day of the week.

The Strap
This model is paired with a silicone strap. Featuring a deep black color, it strikes the perfect balance between durability and flexibility, secured by a stainless steel pin buckle. The lug width is 20 mm.

Water Resistance
This model offers water resistance to 20 atmospheres, or 200 meters. A true companion for deep-water aquatic activities, it's built for freediving. Since it handles water with ease, you can also use high-pressure washers while wearing it - no worries. Showering, bathing, lap swimming, and freediving are all fine. That said, for scuba diving with tanks, we recommend a timepiece with a higher water resistance rating. Also, avoid operating the crown or pushers while submerged to protect the movement's integrity.