As far as the strap versus the bracelet, the Metal-Covered GM2100’s resin strap fits well and is comfortable, although it has a stiff rather than soft feel, and it’s connected to the case via traditional spring bars and has levers that slide on each side so you can switch the strap without any tools. Whereas the Full Metal GMB2100 has screw bars, which are stronger, and allow the bracelet to be removed with a watchmaker’s flat-head screwdriver. The bracelet links, however, have push-pins, not screw-pins, which require you to push them out versus requiring a screwdriver. The bracelet features a dimpled design borrowed from the original look of the 1983 DW-5000C, and has a premium look and feel, and with removable links and 4 micro adjustments on the push-button claps, the fit can be customized more precisely than a strap. Depending on your preference, the total weight of the Full Metal GMB2100 is 168.9 grams versus 71.5 grams for the Metal-Covered GM2100 model. The GMB2100 wears great on the wrist thanks to the relatively conservative 44.4 mm diameter and 49.8 mm lug-to-lug by 12.8 mm case size. Being that this has an aesthetic resemblance to the Royal Oak, going much larger would put it into a whole other territory. And on that note, I think that if this watch reaches critical mass for Casio, it would make sense to offer it in a smaller size as well, just as they have with previous resin, translucent resin, and metal-covered models. Even with a mobile Bluetooth connection, the movement is accurate to -/+ 15 seconds per month. The approximate battery operating time is 7 months when fully charged, with normal use, even without light exposure, and 18 months when stored in total darkness and the power save mode activated. The hour and minute hands move like normal quartz-powered analog hands, with the exception that the minute hands move every 20 seconds, to conserve energy. The dedicated analog display on the right shows the battery level and mode. The small digital display can show hours, minutes, seconds, AM/PM, month, date, and day. Hand shift feature which allows you to move the analog hands out of the way to provide an unobstructed view of the digital display. Measuring Capacity: 24 hours, Measuring Modes: Elapsed time, split time, Measuring Unit: 1/100 second (for the first 60 minutes) 1 second (after 60 minutes)

One simple yet useful upgrade Casio made to the GMB2100, is the addition of lume for the hour markers, not just luminous hour and minute hands, as was the case with the GM2100. Both have on-demand dual LEDs for visibility in total darkness, still, the fully-lumed dial is a nice touch. The combination of stainless steel and glass fiber reinforced resin supports the stability of the watch and provides a better wearing comfort. Signal Range: Up to 2m (may differ depending on surrounding conditions), Auto time adjustment, Easy watch setting, Approximately 300 world time cities, Time & place and Phone finder using the CASIO CONNECTED APPCASIO WATCH+ World Time lets you select from among approximately 300 cities as the World Time City, Displays the current time in major cities and specific areas around the world

While the module is not Bluetooth connected or solar-powered, there’s a certain level of reliability that can be appreciated by a watch you set yourself and that’s powered by replaceable batteries. Not to mention, this allows Casio to offer a solid dial — versus a semi-transparent dial that’s required for sunlight to enter on a solar-powered watch — with the attractive vertical brushed vapor finish. There are almost always trade-offs, and this is a good one considering the dial, to me, is one of the primary highlights of this watch. Powered by any light source, saving time and money as no battery change required- known as TOUGH SOLAR Of the DW-5000C-derived Casio designs, this is one of the best, and while I’d like to see a little more contrast on the dial of the Full Metal GMB2100 or an option for a strap, both the Metal-Covered GM2100 and the Full Metal GMB2100, represent great looking watches, with good Japanese quartz precision, and incredible durability. Perfect for free diving without scuba gear: the watch is water resistant up to 20 bar according to ISO 22810.

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Daily Alarms: Each will sound every day at the time you set, Hourly time signal: The watch beeps every hour on the hour With a push of a button, hands are moving and permit a free visibility of functions like stopwatch or date. In my experience, the brushed surface of the bezel holds up well, even with significant impacts. However, I’m not sure how durable the polished portion of the case will be, although on the sample units the only noticeable scratches were actually on the bezel, which you may notice in some of the photos in this review. Elapsed time, split time and final time are measured with 1/100-sec accuracy. The watch can measure times of up to 24 hours.