A luxury product page: an open-worked movement where every wheel, jewel and spring opens its part.
The same content as the picture, as text: every part and what it says when you open it.
Polished steel around the movement, with a sapphire crystal over the dial and often a second one at the back so the movement can be seen.
The foundation every wheel pivots in. Finished with overlapping circular graining - perlage - which is decoration, and also hides scratches.
A drum holding the coiled mainspring. Winding tightens the spring; as it slowly unwinds it turns the barrel, whose teeth drive everything else. Energy flow: step 1.
Holds the top pivot of the barrel. Bridges are where watchmakers show their finishing: bevelled edges and Geneva stripes.
Finish: Côtes de Genève, bevelled edges
Turns once an hour, and carries the minute hand on the other side of the dial. Energy flow: step 2.
Steps the speed up between the centre wheel and the fourth wheel. Energy flow: step 3.
Turns once a minute, so on many watches it carries the small seconds hand. Energy flow: step 4.
Holds the top pivots of the third and fourth wheels.
Finish: Côtes de Genève, bevelled edges
Fifteen pointed teeth that the pallet fork lets through one at a time - the tick you hear. Energy flow: step 5.
Rocks from side to side with the balance, locking and releasing the escape wheel, and giving the balance a small push each time so it keeps swinging.
The watch's timekeeper. It swings back and forth at a constant rate, and every swing lets the train advance by one tooth. Energy flow: step 6.
A spiral spring, finer than a hair, that returns the balance to the centre of each swing. Its length decides the rate, and its steel is often blued by heat.
The bridge over the balance, fixed at one end only so the balance can be reached for regulation.
Fixed: At one end
Synthetic rubies at every pivot. They are hard and smooth, so a steel pivot turning in one barely wears - which is why a watch counts its jewels.
Runs from the crown into the movement. Pushed in it winds the mainspring; pulled out it sets the hands.
The knurled knob you turn to wind the watch and set the time. Screw-down crowns seal against water.
Watches, cameras, engines and phones, every part named and explained.
