What is also very cool about this watch and shows it is an early one is that is has the Nautilus signed deployant buckle, only the very early ones were signed Nautilus.
This manual wind watch is powered by an 18 jewel Caliber 215 movement.
Released in 1997, in a limited edition of 1000 pieces, this 36mm Reference 5060A is the first reference of the now famous Patek Philippe Aquanaut.