24-hour analog dial

24-hour analogue dial24-hour watch24 hour analog dial24-hour dial24-hour indication watchmechanical 24-hour clocks
Clocks and watches with a 24-hour analog dial have an hour hand that makes one complete revolution, 360°, in a day (24 hours per revolution).wikipedia
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12-hour clock

p.m.a.m.pm
The more familiar 12-hour analog dial has an hour hand that makes two complete revolutions in a day (12 hours per revolution).
The first mechanical clocks in the 14th century, if they had dials at all, showed all 24 hours, used the 24-hour analog dial, influenced by astronomers' familiarity with the astrolabe and sundial, and their desire to model the Earth's apparent motion around the Sun.

Clock

clockstimepiecemechanical clock
Clocks and watches with a 24-hour analog dial have an hour hand that makes one complete revolution, 360°, in a day (24 hours per revolution).
The only other widely used clock face today is the 24 hour analog dial, because of the use of 24 hour time in military organizations and timetables.

24-hour clock

24-hour24-hour notation24-hour format
Using the numbers from 0 to 23 (or 1 to 24) to mark the day is the 24-hour clock system.
The first mechanical public clocks introduced in Italy were mechanical 24-hour clocks which counted the 24 hours of the day from one half hour after sundown to the evening of the following day.

Clock face

dialfacehour hand
A 24-hour watch is a type of watch with an hour hand that completes a revolution every 24 hours.
A second type of clock face is the 24-hour analog dial, widely used in military and other organizations that use 24-hour time.

Breitling SA

BreitlingLéon Breitling
Manufacturers who make 24-hour analog watches include Glycine, Rolex, Breitling, Raketa, Vostok, Fortis, Poljot, Swatch, and many others.
In 1961, Scott Carpenter, one of the original astronauts in the Mercury space program, approached Breitling with the idea of incorporating a 24-hour dial instead of the normal 12-hour dial.

Glycine watch

Glycine
Manufacturers who make 24-hour analog watches include Glycine, Rolex, Breitling, Raketa, Vostok, Fortis, Poljot, Swatch, and many others.
It is famed for its Airman line, debuted in 1953, a collection of GMT watches featuring 24-hour analog dials and rotating bezels, favoured by both military and commercial pilots.

Slow watch

Slow watch (Swiss)
The Slow watch is a line of 24-hour analog dial watches made by Slow watches.

Greenwich Mean Time

GMTGMT+4UTC±00:00
When it is used, the top of the watch always represents midnight (or noon) GMT.
24-hour watch – 24-hour wristwatch

Watch

wristwatchwatchesdigital watch
Clocks and watches with a 24-hour analog dial have an hour hand that makes one complete revolution, 360°, in a day (24 hours per revolution). A 24-hour watch is a type of watch with an hour hand that completes a revolution every 24 hours.
The Breitling Navitimer Cosmonaute was designed with a 24-hour analog dial to avoid confusion between AM and PM, which are meaningless in space.

Hour

htime of dayhr
Clocks and watches with a 24-hour analog dial have an hour hand that makes one complete revolution, 360°, in a day (24 hours per revolution).

Day

ddiurnaldays
Clocks and watches with a 24-hour analog dial have an hour hand that makes one complete revolution, 360°, in a day (24 hours per revolution).

Sundial

sundialssun dialequatorial sundial
Sundials use 24-hour analog dials—the shadow traces a path that repeats approximately once per day.

Senenmut

There are diagrams of circles divided into 24 sections in the astronomical ceiling in the tomb of Senemut.

Astrolabe

astrolabesAstrolabastrelabie
Medieval clocks often used the 24-hour analog dial, influenced by the widespread example of the astrolabe.

Roman numerals

Roman numeralRomanRoman number
In Northern Europe, the double-XII system was preferred: two sets of the Roman numerals I to XII were used, one on the left side for the night and morning hours, and another set on the right side of the dial to represent the afternoon and evening hours.

John Harrison

H-4H4H4 and H5
John Harrison, Thomas Tompion, and Mudge built a number of clocks with 24-hour analog dials, particularly when building astronomical and nautical instruments.

Thomas Tompion

Tompion
John Harrison, Thomas Tompion, and Mudge built a number of clocks with 24-hour analog dials, particularly when building astronomical and nautical instruments.

Thomas Mudge (horologist)

Thomas MudgeMudgeThomas
John Harrison, Thomas Tompion, and Mudge built a number of clocks with 24-hour analog dials, particularly when building astronomical and nautical instruments.

Sidereal time

sidereal daysidereallocal sidereal time
24-hour dials were also used on sidereal clocks.

Big Ben

Elizabeth TowerClock Towerclock tower of the Palace of Westminster
The famous Big Ben clock in London has a 24-hour dial as part of the mechanism, although it is not visible from the outside.

Rolex

TudorOyster DateRolex Australia
Manufacturers who make 24-hour analog watches include Glycine, Rolex, Breitling, Raketa, Vostok, Fortis, Poljot, Swatch, and many others.

Raketa

Raketa MonumentalRaketa Monumental in Detsky Mir on Lubyanka Square in Moscow
Manufacturers who make 24-hour analog watches include Glycine, Rolex, Breitling, Raketa, Vostok, Fortis, Poljot, Swatch, and many others.

Vostok watches

VostokVostok Watch Makers, Inc
Manufacturers who make 24-hour analog watches include Glycine, Rolex, Breitling, Raketa, Vostok, Fortis, Poljot, Swatch, and many others.

Fortis (Swiss watchmaker)

FortisFortis AG
Manufacturers who make 24-hour analog watches include Glycine, Rolex, Breitling, Raketa, Vostok, Fortis, Poljot, Swatch, and many others.

Poljot

First Moscow Watch Factory1st Moscow Watch FactoryFirst Moscow Factory
Manufacturers who make 24-hour analog watches include Glycine, Rolex, Breitling, Raketa, Vostok, Fortis, Poljot, Swatch, and many others.