Convertible watches have the ability to transform themselves.
For instance by changing their appearance using mechanisms such as an aperture like the Valbray V.01 or switching functions, going from a wristwatch to pocket watch for example.
Some convertible timepieces such as the Tag Heuer 69 (pictured) have the ability to switch from analogue to digital displays.
These type of watches aren’t actually new, Gruen in 1910 made a convertible pocket watch aimed at women which came with a bracelet to transform it into a wristwatch.
Earlier, in the 19th century soldiers started modifying their pocket watches so that they could be worn on their wrists by fitting them with makeshift cupped leather holders converting them from pocket watches into wristwatches.