1525 This clock is engraved in honour of its owner, King Sigsmund I of Poland. Around the edge are his arms and an inscription in Latin, "when you count the years 1525 Jacob Zech made me in Prague -- it is true". This clock contains the earliest surviving fusee, a device to even out the unequal force produced by the mainspring as it unwinds. The fusee was invented in the mid 1400s. By Jacob Zech, Prague Spring driven wit hfusee, verge escapement, balance
aperture=f3.2 focal length: 60.0 mm exposure 1/125 sec ISO: 3200