Brand: SeikoModel: Speedtimer Mechanical ChronographReference link Number: SRQ043Diameter: 42.5mmThickness: 15.1mmLug to lug: 50mmCase Material: Steel with Seiko's Super-Hard link coating Dial Color: BlueIndexes: AppliedLume: YesWater Resistance: 1oo metersStrap/Bracelet: Steel bracelet with fold-over link clasp and an additional calf leather strap.

All of this link is to say that when you find an Aquastar today, you can tell that it has been put through its paces. Look no further than the great patina link that this example has taken on, with the dial fading from an original steely black to a rich caramel-esque tropical brown. Note that the case has been left unpolished after all of these years because, well, why would you want your dive watch to be extra shiny? Check out this Aquastar 63 link in the HODINKEE Shop.

The link second Nautilus to hit the HODINKEE Shop is noticeably different from the first, despite retaining the exact same reference number. Yes, this is a reference 5711/1A-010, the one you love and know. After passing the last link Nautilus on to a new owner, we knew the second one had to be special and this link one is just that.