When the Japanese electronics firm released the first G-Shock in 1983, it didn’t know the watch would prove so durable—in more than one sense of the word. Few product brands last for more than 35 years. But the Casio G-Shock line is a cultural institution. Developed by engineer Kikuo Ibe after he dropped and broke a pocket watch given to him by his father, the G-Shock line includes the world’s most durable watch as deemed by observers from the Guinness Book of World Records after it survived the weight of a 25-ton truck.