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Comparison Casio WVA-M650TD-1A vs Casio WVA-M640TD-1A

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Casio WVA-M650TD-1A
Casio WVA-M640TD-1A
Casio WVA-M650TD-1ACasio WVA-M640TD-1A
from $245.96
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from $268.00 up to $279.60
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Gendermen'smen's
Country of originJapanJapan
Mechanism
Movement typequartzquartz
Second hand+
Power sourcesolar batterysolar battery
Power reserve indicatior
Dial
Dial typemixedmixed
Type of indexmarksmarks
Colour
black
black
Backlightluminescent coating/electronicluminescent coating/electronic
Features
alarm
stopwatch
timer
day of the week
date
month
world time
radio controlled
alarm
stopwatch
timer
day of the week
date
month
world time
radio controlled
Case and strap
Case shaperoundround
Case materialtitanium
titanium /plastic/
Colourstainless steelstainless steel
Glass materialplasticplastic
Straptitanium bracelettitanium bracelet
Strap colourstainless steelstainless steel
Claspclip (unfolding)clip (unfolding)
General specs
Waterproof100 WR / 10 ATM100 WR / 10 ATM
Diameter (width)43 mm44 mm
Thickness15 mm12 mm
Weight90 g
Added to E-Catalogoctober 2015october 2015

Second hand

The watch has a separate second hand. Note that the location and features of the operation of such an arrow may be different. So, in some watches it is installed on the same axis with the rest of the hands, in others a separate small dial is provided for counting seconds. On some models, the second hand is part of the chronograph (see Features/Features) and only moves when the chronograph is on.

Diameter (width)

The nominal size of a watch case in diameter (for round cases) or width (for other options, see "Case Shape"). In the most miniature modern models, this size is 21 – 25 mm or even less, among the largest there are cases of 46 – 50 mm and even larger.

Larger watches are more convenient in the sense that the dial readings are better visible on them, and it is easier to provide various additional functions in the design. On the other hand, small watches look neater and create less discomfort directly when worn. In addition, female models (see "Gender") are traditionally made more miniature than male ones. So the choice for this indicator depends mainly on the intended specifics of the application: for example, large cases are best suited for outdoor activities and tourism, about 41 – 45 mm in size, for household wear (regardless of gender) — about 31 – 35 mm, and as an accessory to an evening dress, a small watch of 30 mm or less would be more appropriate.

Also note that the size of a compatible strap/bracelet is associated with this indicator — see "Strap Width" for details.

Thickness

The thickness of the watch case. A fairly obvious parameter; we only note that nowadays it is customary to attribute watches with a thickness of less than 7 mm to ultra-thin models. This design has both aesthetic and quite practical meaning — a thin watch will be useful for those who wear narrow sleeves with tight-fitting cuffs.

Weight

Total weight of the watch. As a rule, it is indicated taking into account the complete strap/bracelet.

The lightest modern watch weighs no more than 50 g. The most popular models weigh 50 - 100 g, and weight more than 150 g most often means not only a large, but also a fairly advanced device, usually for sports and tourism purposes.

Both light and heavy weight have their advantages: light watches create minimal inconvenience when worn, while massive watches are subconsciously perceived as a solid and reliable device.