The investigation of the torsional creep and recovery behavior of a coordination polymerZn[OP(Ph)(Me)O]2at five temperatures from 100 to 200°C has revealed an unusual rheological behavior. A high temperature aging effect which appears at least partially reversible is observed. Observed creep deformation which is linear in time, followed by a delayed recovery, is explained as a consequence of a void in the retardation spectrum. Temperature reduction is achieved and the temperature shift factors are analyzed in the light of the WLF equation. The measurements were made with a recently developed creep instrument which employs a magnetically levitated rotor and a drag cup motor for precision torque production.