The Citizen Promaster Mechanical Diver 200M NB6021 is presented with two strap options. The movement is hidden from view by a solid titanium caseback. 200 Gauss) as close as 1cm away, which is certainly reassuring. As we’ve learned before, this movement is anti-magnetic to fields up to 16,000A/m (approx. It offers a decent 42h power reserve and is regulated to run within -10 to +20 seconds of deviation per day. This automatic movement runs at a frequency of 28,800vph and uses 24 jewels. Power comes from Citizen’s in-house produced Calibre 9051, which we’ve already seen in the Promaster Mechanical Diver 200M NB6004 and the Series 8 831 Mechanical NB6010 and NB6012. The date window cuts into the 3 o’clock index and is outlined in white. It’s covered with a flat-top sapphire crystal, with a bevelled edge and a domed underside. Again, all are treated with the same green glowing luminous material. Time is indicated by a Mercedes-style hour hand, a sword-shaped minute hand and a lollipop seconds hand. It has quite a strong glow, which can be seen during the day as well when properly charged by direct sunlight. Each is filled with a good dose of luminous material in a retro green hue. The dial comes in either black or blue, with embossed rectangular indices. Its alignment is spot-on, something that matters a great deal in a tool that could potentially save your life. It grips easily and turns with a reassuring feel and a smooth “click”. This has a black or blue insert with a crisp silver 60-minute diving scale and a luminous pip inside the triangular indicator. It does provide for an interesting visual appeal, further enhanced by the brushed finishing on the case and the polished outer surface of the bezel. The way it’s constructed it seems like the bezel is slightly wider than the middle case, but both have the exact same width. The case measures a reasonable 41mm in diameter and 12,3mm in height. The 2000 ASPEC World Time, the first watch to apply the Citizen Duratect surface-hardening technology to create a material later called Super Titanium
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