The day of the month, displayed in a window on a watch dial typically at the 3 o'clock or 6 o'clock position.
Helium escape valve
Decompression system which allows helium to escape from inside the watch when the watch is worn for professional use in pressure chambers. (Long-term underwater work, crude oil exploration, etc.)
Self-locking crown, screwed into the tube of the case, used for highly water resistant divers' watches.
Unidirectional rotating bezel
A bezel which turns in only one direction. Particularly useful for divers who cannot accidentally rotate it in the wrong direction, which could cause them to miscalculate their dive times. A rotating bezel makes it easy to measure elapsed time.
- Between lugs: 20 mm
- Bracelet: steel
- Case: Steel
- Case diameter: 41 mm
- Dial colour: Blue
- Crystal: Domed anti‑reflective, scratch‑resistant sapphire crystal
- Water resistance: 30 bar (300 metres / 1000 feet)
- Calibre: OMEGA 1538
- Quartz precision movement with rhodium‑plated finish. End of battery life indicator
- Battery life: 42 months
- Type: Quartz
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