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In order to read the time, blind people most commonly use hunting timepieces with the opening glass lid, touching the watch face with the tips of the fingers to feel the position of hour hands. The first wrist watch models for the blind, among which was Tact Watch by Breguet, were patented back in the 18th century (Tact Watch by Breguet).

Tips of the fingers of some are sensitive enough to read the time almost accurately with one touch. But for many people reading is complicated, not to let alone that reading the time this way, despite the gentleness of touching, can cause the distortion of hour hands or even damage them, change their position, thus making greater the chance of error.

But others have problems reading the time this way, besides, however gentle the touch is, it can still distort or even break hour hands, change their position and enlarge the error probability.

In order to resolve this matter, an Austrian from Vienna introduced conventional symbols instead of the Roman numerals, the shape of which figuratively looks like the figure of hours which they represent.
The system of Lukaschovsky – it is the name of the deviser is about representing one hour by a dot, two hours by two dots, three hours by a triangle, four hours by a square, five hours by a five-pointed star, six hours by a zero.

The method of Lukaschovsky it is the name of the deviser consists in representing one hour by a dot, two hours by two dots, three hours by a triangle, four hours by a square, five hours by a five-pointed star, six hours by a zero. These signs are convex in the first half of the watch face; in the second symmetrical half the signs are concave.
As for the hour hands, they are made of steel and are rather solid to resist frequent touching of fingers.

Another system, made up by a watchmaker from Locle, P. Tissot, has the advantage of using the Braille method, already known to the blind.

The minute divisions are indicated by smaller convex dots.