Definitions for "Shock resistant"
Shock resistant refers to a watch movement in which the balance staff end stone jewels are sprung allowing for a certain amount of give when that watch is subjected to a shock.
A watch qualifies as “shock resistant†if it can be dropped 40 inches to a hardwood surface. This drop must not stop or damage the watch.
According to U.S. government regulation, a watch must be able to withstand to impact equal to being dropped to a wood floor from a height of 3 feet in order to be labeled shock resistant.