First released in 1969, the El Primero is one of the most famous movements in all of horology. In addition to being one of the first automatic chronograph movements, the El Primero has a faster beat rate than most, allowing it to measure finer slivers of time. The Striking Tenth took great advantage of this capability, and you can read all about it here.
But today we’ve got a short audio clip for you of the El Primero in action. Recorded in a sound studio, this clip gives you a good sense of just how fast 5 Hz actually is. Give it a listen and check out the full line of El Primero based watches here.