The semicrystalline structure of isotactic polypropylene (iPP) moulded by oscillating melt-flow (rheomoulding) has been studied using low-frequency Raman scattering (coupled with optical interference reflection microscopy and wide-angle X-ray scattering). It was compared to the structure of typically moulded iPP. We observed that only the relatively narrow central zone of the bar has a spherulitic organization in the rheomoulded specimen, while the external layers on each side have a perfectly oriented crystalline structure. The crystal structure, the orientation, the size of the crystallites and the effect of annealing were determined.