The Aquanaut began in 1997 as the Nautilus's younger sibling and has grown into a pillar of the house in its own right — the same Genta-descended geometry, rendered lighter, sportier, and on the “Tropical” rubber strap that made it the modern Patek to actually wear.

The 5167A is the reference in its purest form: 40.8 mm of steel, the embossed black dial echoing the strap's pattern, and the calibre 324 S C visible through the sapphire back. Demand has long outstripped supply at retail, and clean full-set examples like this one — complete with certificate of origin — are the configuration collectors compete for.

An uncomplicated watch in the best sense: one decision, no regret.

An excellent example showing only the lightest evidence of careful wear. The embossed dial is flawless; the strap is original and supple. Complete with box and certificate of origin.