And while the 4061 functionally behaves exactly like the famed El Primero 400 caliber which made its debut in 1969, it was developed specifically to put as much of the high-beat ballet as possible in full view. That’s where the El Primero 4061 ‘Open’ caliber has an edge – this high-beat movement is actually quite a treat to watch front and back, as the 5Hz oscillation rate (10 beats per second) delivers an ultra-smooth sweep seconds hand, and an escapement that jumps back and forth at a truly frenetic pace. With most automatic movements, an open heart is a fun distraction, but the novelty isn’t usually long-lasting, as a traditional ETA 2824 or Valjoux 7750 starts to feel a little too familiar.
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