The Wells Cathedral clock is one of the oldest clocks in the world. It's been dated to 1392, although the dial was probably added many years later. The clock has been frequently updated and revised over the years, and the orginal works are now in the London Science Museum, still working (and ringing). In this photo, the time is nearly 09:42.
The Astronomical Clock on the Old Town Hall, Prague, Czech Republic - (1410) constructed by the clockmaker Mikulas of Kadan in collaboration with Jan Ondrejuv called Sindel, professor of mathematics and astronomy of Prague Charles University. The astronomical dial (astrolabe on the clock face) with its mechanism is working to this day.
Delft Shelf Clock from the collection of Hervey St. Helens, born in 1909, one of 7 children. He lived in the same home in Rochester, NY all his life, & served in the army during WWII. He earned a Masters Degree in physics at the University of Rochester & also worked at Kodak. Clock collecting became his hobby & he diligently sought after time pieces for 93 years of his life.