Caliber
A caliber can be described as the type of movement used in a watch. It is expensive and impractical to design a unique movement for each watch model, so most manufacturers often use the same movement in different watch models, sometimes with significantly different designs. The term "caliber" is due to the fact that initially the type of movement was designated by a number (in inch lines) corresponding to its largest size; however, today unique names or alphanumeric indices that are not directly related to sizes are widely used.
Knowing the name of the caliber on which the watch you are interested in is built, you can, if desired, find more detailed information about the mechanism and determine how its characteristics meet your requirements.
Accuracy
The accuracy of the rate is usually determined by the largest error — the deviation from the reference time, which can occur in a month when the watch is constantly running in normal mode. Accordingly, the smaller the number in this paragraph, the more accurate the clock. In addition, the accuracy of the movement is a kind of status indicator: if the error exceeds the values stated in the characteristics, this may indicate a malfunction in the mechanism.
If the accuracy indicators are the same both in advance and in lag, one number is indicated in the characteristics — for example, 30 sec / month (i.e. +/-30 sec / month); however, many mechanisms have unequal deviations, for example -15/+25 sec/month. Also note that this parameter is relevant only for quartz watches (see “Movement type”): in mechanical models, the accuracy of the rate is noticeably lower, it is measured in seconds not per month, but per day.
Bezel material
— Stainless steel. An inexpensive yet very practical material. "Stainless" looks decent, resists corrosion and scratches well, and retains its marketable appearance for a long time. However, it is quite heavy.
— Aluminum. Considered slightly more advanced than stainless steel. Aluminum alloy is also strong, corrosion and scratch-resistant, and has a solid appearance. On one hand, it is noticeably lighter, but on the other, it is more expensive.
— Titanium. A premium-class material used in watches of the corresponding price level. Titanium alloys combine lightness and high strength. They are practically resistant to corrosion, do not require protective coatings, and are hypoallergenic. On the downside, titanium is quite sensitive to scratches.
— Gold. The bezel is made of jewelry gold or has a gold-plated coating. Note that the color can vary: besides classic yellow, white and red gold are also available. In any case, such watches are quite expensive and look the part; they are mainly aimed at those who need a rich, image-enhancing accessory rather than just a timepiece.
— Plastic. The common features of all types of plastic are ease of processing, relatively low cost, light weight, hypoallergenic properties, and moisture resistance. However, it is worth noting that there are many types of plastic, including high-strength varieties that are as reliable as steel.
— Carbon. A composite material, essential...ly high-quality plastic: carbon fiber threads embedded in a polymer filler. Carbon is notable for its combination of light weight and very high strength, overall surpassing even steel in reliability; at the same time, it has many advantages of plastic. A drawback, aside from the high cost, is its sensitivity to localized impacts.
— Ceramic. Ceramic refers to various materials produced by sintering and firing at high temperatures. This material stands out for its solid appearance and very high scratch resistance. At the same time, ceramics are quite sensitive to impacts.
