Band width
The nominal width of the strap/bracelet supplied with the watch. It is indicated by the width of the fasteners for installing the strap on the case.
This parameter does not play a special role when choosing a watch, but it is key when choosing a third-party strap / bracelet — for example, to replace a broken one. If the width of such an accessory does not correspond to the characteristics of the watch, it will be very difficult to install it at best, and most often it will be impossible at all.
Also note that in most cases this width is about half the width of the watch itself (see "Diameter / Width"). For example, 32 mm watches are usually equipped with 14 mm straps, and for 43 mm cases this width is 22 mm. However, there is no strict dependence here, and models with the same case sizes may differ in the size of straps/bracelets.
Magnetic-resistant
The watch has special protection against magnetic fields.
Strong magnetic fields can adversely affect the performance of any watch. Mechanical models are especially sensitive to them (see "Type of mechanism") — in such devices there are many small moving parts, the magnetization of which can lead to a complete stop of the movement. However, for quartz watches, such effects are undesirable. So
magnetic protection can be found in all kinds of mechanisms; it is usually implemented due to the special design of the case, and in mechanical models — also through the use of special anti-magnetic materials.
Note that this feature significantly affects the cost; at the same time, most household sources of magnetic fields (speakers, mobile phones, magnetic fasteners on clothes and accessories, etc.) are not so powerful as to seriously damage even an ordinary clockwork. So it makes sense to specifically look for magnetically resistant watches mainly for use in special conditions. For example, such a watch can be useful to a physician working with a magnetic resonance imaging scanner, or an engineer maintaining equipment at a power plant.
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.
