Automatic winding mechanical movement. Oyster steel case by Rolex, 39 mm diameter. 60-minute graduated bidirectional rotatable bezel, marked in 5-minute intervals with one-minute subdivisions between the 0 and 15 marks. Black dial punctuated with large and highly visible square-shaped hour markers, shield Tudor logo at 12; a symbol of resistance and reliability. Its hands, nicknamed “snowflakes” by collectors, were enhanced with luminous squares intended to optimize readability. Flat, thick, and prominent plexiglass crystal. Screw-down signed Rolex crown. Steel screw-down case back by Rolex. Morellato leather strap with unoriginal pin-buckle.