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More than just a pretty face, the Citizen Eco-Drive Calibre 2100 men's stainless steel watch offers stylish lines that nicely complement both business and casual couture. But it's also one of the most advanced chronograph watches made by Citizen, offering a reset button that instantly returns all the chronograph registers to zero. The chronograph timing function includes 60-minute, 12-hour, and independent second-hand subdials, as well as a center sweep 1/5-second hand.
This large, round watch has a thin, flattened bezel with an exterior tachymeter reading in black. The black dial face is accented by black subdials, and it offers white luminous Dauphine hands (with seconds hand) and a date function at 4 o'clock. The stainless steel bracelet band is joined by a fold-over deployment clasp. Other features include a screw-back case, screw-down crown, scratch resistant mineral crystal with anti-reflective coating, and water resistance to 660 feet (200 meters).
This watch is powered by Citizen's unique Eco-Drive, which absorbs sunlight and any artificial light through the crystal and dial to recharge the watch continuously. With regular exposure to light, the Eco-Drive continuously recharges itself for a lifetime of use. This watch's Eco-Drive provides a 240-day power reserve, and it can be recharged with just 3.5 hours of exposure to light.
Summary of Features:
- Assembled by hand
- 1/5 second chronograph measures up to 12 hours
- Power reserve meter
- Alarm
- Date
- Non-reflective mineral crystal
- Screw-back case and screw-down crown
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Technical Details
- Ecologically friendly, light powered Eco-Drive Caliber E210 Japanese-quartz movement; Charges in natural sunlight or indoor light- Max power reserve: 240 days; Low charge warning: 7 days; Charge time from stop state to max charge: Incandescent Light - 150 hours, Outdoors, Cloudy (10,000 Lux) - 45 hours, Outdoors, Sunny (100,000 Lux) - 8.5 hrs
- Durable, hardened non-reflective mineral crystal; Case diameter: 46 mm; Assembled by hand; 1/5 second chronograph measures up to 12 hours; Power reserve meter
- Stainless-steel case; Black dial; Date function between 4 to 5 o'clock; Alarm function; Screw-back case and screw-down crown
- Water-resistant to 660 feet (200 M)
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By E. J. Lapham IV (Portland, OR)
I just got this for Christmas from Fiance and I gotta say I love it!
It's larger than I expected. It's also heavier than I expected. In other words, it's a girthy machine.
I also wasn't aware of the asymetry of the case. The right side is circular, but the left side is artistically slanted, flairing outwards to the inside of the wrist. I must say, from a industrial designer aspect, this unexpected aesthetic absolutely makes the watch. It's subtle surfacing like this that makes you look at it just a little bit longer.
As for the functionality, I was a little worried when I saw how thick the manual was. But, the original packaging also came with a mini CD ROM that has a wonderful tutorial to get the watch set up. It takes you through the time, then the date, the alarm, the chrono, the tachymeter, and how the eco-drive system functions. I must say, it's much easier to use than I expected.
I would like to thank a previous reviewer on here for suggesting the black face. This is definitely the model to get. The brushed alluminum, black face, white dials provide class and contrast. It's very easy to read. I'm glad I didn't ask for the white face (my first choice).
Overall, this is an exceptional piece for the price. It has that perfect blend of geek and sleek that's a tricky line to tread.

By Thomas R. Rogers (Burlington, VT)
I'm a watch lover and have several high end watches (it's my thing, what can I say). With that said, whenever I get the chance I've got the Calibre on. I love the look (the chronograph is awsome), the weight, and the general overall feel of the watch on my wrist... It's a joy! Oh yea, it keeps incredible time and is as good as anything on the market in this price range. I bought one for my son as well!!!

By The Clock
I bought this watch about 2 or 3 years ago, being ready for my first "nice" watch, a step up from the Casio and Timex stuff.
My reqirements were 200m water resistance, a chronograph, date funtion, all-analog features, white hands on a black face, and a stainless or titanium case, and that led me to this machine, which has an outstanding alarm feature and lumeniscent hands and dial to boot.
The glow-in-the-dark hands are REALLY bright, and hours after the lights go out you can still read them.
It's a bit heavy and bulky, but that was part of its appeal to me. I cannot recommend this watch if you demand light weight and thin, though. The chronograph and the watch itself hold accuracy well, it's simple to use, and it looks good for dress or casual. I get asked about it often, and it's functional.
I am impressed with it's accuracy. Against an atomic clock it gains only one second in two weeks. Thats about 26 seconds a year, which is good for a wristwatch, especially a sub-500 dollar watch.
I am both a pilot and a diver, and this could serve either role, although I would not risk it in deep water simply because I like it too much; despite the depth rating, it's better to use a dedicated dive watch.
Overall, I am very satisfied with this watch, and with Citizen Eco-drive watches in general. This is a real "guy's" watch, with it's look and feel. I feel I got my money's worth, and if the watch is as rugged and well-made as it has shown so far, I will probably still be using it for many years to come.

By JB (Eastern USA)
After owning this Citizen Eco-Drive drive for a short period, I simply have to echo the other reviews on here and say that this is an outstanding watch. It's large, bold styling looks great on my (large) wrist. It is solid without being overly heavy.
The alarm function is a nice bonus, though it is definitely not loud enough to wake up anyone but the lightest sleepers (in case you had considered that). The stopwatch feature actually does come in handy on occasion. And for those who have only dealt with traditional quartz watches in the past, it is a pleasure to have the Eco-Drive feature and not have to concern yourself with periodic battery replacements.
Again, a great watch, and highly reccomended.

By Alex Nichols (Seattle, WA USA)
Initially I was hesitant about this watch because I noticed that some people said that watch was heavy and too big, however, I am very pleased with how it fits.
Before buying it I went to Macy's and tried on the titanium version, which felt alright.
After buying it I took it to Fred Meyer to get 3 links taken off. The watch tech said that the band is prone to breaking later down the road due to some special pins that it has. Although the watch was not charged very much when I arrived, putting it on the window sill during one sunny weekend charged it fully.
After a couple months of wearing the watch to work 5 days a week I have grown to love this watch. The weight and size is perfect for my average wrist. I highly recommend getting this watch.
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