Stainless steel, self-winding, tonneau-shaped, diver’s wristwatch, water-resistant with screwed case-back, 60-minute graduated bidirectional revolving bezel with black insert for the decompression times, black colour dial with centre-seconds and one horological complication:• Half-instantaneous date of the month (aperture at 3 o’clock)

Ref Variations: ST166091SC,