A. Lange & Sohne Ursa Major

Movement: mechanical, self-winding.
Size: diameter 46mm, height 12 mm.
Functions: hours, minutes, seconds, date, day-night.
Case: steel.
Mineral-crystal glass.
Caseback on screws with transparent window.
Dial: black, oblong hour markers.
Strap / Bracelet: leather with deploying clasp.
No docs and box