Sellita calibre SW510A automatic movement based on Sellita SW500-1, features 27 jewels and a frequency of 28800 vph with approx.48 hours power reserve. Silver-tone stainless steel case measuring 42mm diameter by 15mm thickness. Fixed stainless steel bezel incorporating an inlaid blue ring displaying tachymeter markings. Blue dial accented by luminous silver-tone hands and index hour markers, including Arabic numeral minute markers at 5-minute intervals around the outer rim. Analog dial type with luminescent hands and markers visible in low light conditions. Date display located between the 4 and 5 o'clock positions. Chronograph functions feature three sub-dials: a central one for seconds (60-second scale), one for minutes (30-minute capacity) and another for hours (12-hour format). Blue leather strap with 22mm width, adjusted to fit an 8-inch wrist circumference using the tang clasp mechanism. Scratch-resistant sapphire crystal protects against surface damage. Pull/push crown operation. Transparent case back allows visibility of internal components. Round case shape. Water resistant up to 50 meters / 165 feet depth suitable for swimming and snorkeling activities but not scuba diving. Functions include chronograph, tachymeter, date display, hour, minute, second hand movements. Sport watch style design. Belongs to the Aviator Series collection from Revue Thommen. Swiss Made label indicating origin and quality standards.