Seiko Prospex Land watches

Seiko's Prospex Land series is the brand's line of explorer's watches for mountaineers and outdoor use, many of them with a rotating compass bezel. Its Kinetic GMT models were modelled on the top-of-the-line Prospex Landmaster, which Seiko sold only in Japan.

The Prospex Kinetic GMT comes as the SUN047, SUN049, SUN051 and SUN053, with strap versions such as the SUN049P2. It runs on calibre 5M85, which is wound by an oscillating weight as in a mechanical watch, but the rotor generates electricity that is stored in a capacitor. A full charge lasts six months, accuracy is rated at plus or minus 15 seconds a month, and pressing the button at 2 o'clock sweeps the seconds hand to show the remaining charge. The 45.6 mm steel case has a rotating compass bezel, 100 m water resistance and a Hardlex crystal, Seiko's hardened mineral glass. The SUN059P2 with a blue dial, the SUN061P1 with a brown dial and the black-dial SNE421, SNE423 and SNE425 share the 45.6 mm size and the compass bezel.

The 42 mm models are plainer: the SRPA71, SRPA73 and SRPA75 have black dials, on bracelet or strap. The SSC075 brings the compass bezel down to 42 mm.

The SBDB015 is a Prospex Landmaster itself, the line the Kinetic GMT took its cue from. It is a different proposition: 46.7 mm across and 14.2 mm thick, with a sapphire crystal in place of the Hardlex used on the other models.