  We experimentally study the response of star-shaped clusters of initially
unentangled $N=4$, 10 and 37 nuclear spin-$\frac{1}{2}$ moments to an inexact
$\pi$-pulse sequence, and show that an Ising coupling between the centre and
the satellite spins results in robust period-two magnetization oscillations.
The period is stable against bath-effects but the amplitude decays with a time
scale that depends on the inexactness of the pulse. Simulations reveal a
semiclassical picture where the rigidity of the period is due to a randomizing
effect of the Larmor precession under the magnetization of surrounding spins.
The time scales with stable periodicity increase with net initial magnetization
even in the presence of perturbations, indicating a robust temporal ordered
phase for large systems with finite magnetization per spin.
