Mechanical watch is the mechanical movement of watch which collects its energy from a wound spring and continues to track time through the regulated release of the energy via set of fine and delicate gears and an escapement. It differs largely from a quartz watch because unlike quartz mechanical movement dies not take its energy source from any battery power. Mechanical watches can run about 40 hours on one complete winding of mainspring however a few designs are also available with a power reserve facility for 8-10 days at a stretch.

What is the difference between movement, caliber, and an ebauche?

A watch movement is a complete mechanism placed inside a watch which operated the watch on its own. An ebauche means a raw and unassembled and incomplete movement which includes prime structural components like bridge, plate etc. and certain parts like wheel train and other moving parts. A caliber is the unit name of a series of movements of similar design.

What is hack seconds feature?

Hack second feature is said to be an army term; it refers to the watches which has the facility of stopping the second hand which allows better grasp on imposing accurate synchronization between two watches. There are many types of hacking watches available in market. The most common form of this type when the crown is pulled out to the time setting position, a lever gets moved in contact to the rim of balance of the watch and this stops the movement till normalcy is restored.

What is meant by 17-jewel?

Good quality watches use traditionally jeweled movements; ruby or synthetic ruby are used here for running the watch movement. These jewels are functional these work as bearings for the wheel train as impulse jewel and escape lever.

Presently standard manual wind watches maintain a standard complement of 17 jewels in general. The configurations are like:
1-impuse jewel
2-5-balance staffs pivot bearings
6-7-one pair of escape lever pallets
8-9-bearing [one pair] for escape lever pivot
10-11 one pair escape wheel pivot bearings
12-13 one pair 4th wheel pivot bearing
14-15 one pair 3rd wheel pivot bearing
16-17 one pair center wheel pivot bearing

The mechanical watches with additional facilities like chronograph calendars etc. can increase the use of jewels. There are watches which come with 76 jewels even.

What is shock protection?

As a mechanical watch is made of multiple tiny and delicate parts, and some of them are in consistent and continuous motion there should have been some extra safety protocol to save their settings against jerk, etc. Shock protection device is implemented to ensure better safety of the watch. It is applied mainly on balance of the watch.

What is meant by T, T<25, and small sigma of watch dial?

T means Tritium, a low- level radioactive element, is used on hour markers of the watch for its luminosity.

T<25 signifies same but it denotes its using quality which is 25milliCuries only.

Small sigma on watch dial means the markers are made of solid gold.

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