Build Breakdown

The replica aquanaut 51671A 40.8mm is the reference 5167/1A-001, widely regarded as the entry-level men’s Aquanaut in stainless steel. At 40.8mm, this is the core time-and-date model that established the Aquanaut as a serious contender alongside its older sibling, the Nautilus. The 5167/1A-001 features a date display with sweep seconds, powered by the caliber 324 SC automatic movement. Its embossed chequerboard dial pattern and tropical composite strap deliver the signature Aquanaut look that has remained consistent since the collection launched in 1997. Steel construction throughout the case and folding clasp keeps this reference firmly in the sport watch category.

What Collectors Notice

The 5167/1A-001 holds a specific place in the Aquanaut hierarchy as the most accessible men’s reference. Caliber 324 SC provides approximately 45 hours of power reserve with center seconds and date at 3 o’clock.

• Case: 40.8mm stainless steel
• Movement: caliber 324 SC, automatic
• Functions: hours, minutes, sweep seconds, date
• Dial: embossed chequerboard pattern
• Strap: tropical composite with fold-over clasp
• Crystal: sapphire with anti-reflective coating
• Water resistance: 120 meters

See how the chronograph variant compares by checking the Aquanaut 5968R-001 Chronograph 42.2mm.

This vs Other Versions

Against the white gold 5168G references at 42.2mm, the 5167/1A-001 takes a more understated path with its steel case and slightly smaller diameter. Against the Luce models at 35.6mm and 38.8mm, this is a decidedly masculine proposition. The 5167/1A-001 is the Aquanaut in its purest men’s form: steel case, composite strap, date complication, no diamonds, no precious metal. Browse our Aquanaut collection for the complete range. This replica aquanaut 51671A 40.8mm remains the foundational piece that every other Aquanaut reference is measured against.