The invention of the very first personal, portable watch is widely credited to a German locksmith and clockmaker named Peter Henlein. In 1505, Henlein revolutionized timekeeping by utilising a miniaturised mainspring mechanism to create the world’s earliest working model, known historically as Watch 1505 or the Pomander Watch. This rare, fire-gilded copper and brass sphere was small enough to be worn as a pendant or attached to clothing, earning similar early models the nickname “Nuremberg Eggs” due to their oval shapes. Detailed historical records from Wikipedia’s Watch 1505 entry and Britannica’s Watch History outline how this single-handed device fundamentally transformed clocks from stationary furniture into wearable, personal accessories.