In 1972 Rolex gave me three watches to use in a field experiment (a story for another time). The Rolex rep I was working with happened to be coming to DC that weekend, so he brought the watches to me. In the course of our conversation we got into how durable Rolex were compared to Omega (NASA had just chosen Omegas for the astronauts and Rolex wasnt happy). To prove his point, he took off his watch (which was either a Submariner or a SeaDweller) and threw it up in the air about 6 feet. It landed hard onto a hardwood floor he did this several times. It kept right on running. I chose not to try that with my personal 1680, but I was impressed!