Proline Decorative Concrete Systems MD7800 8' Diameter Old World Compass Medallion 4 Pieces Concrete Stamp. Prolines beautiful Old World Medallion can enhance the look of any area, indoors or out. This Medallions embodies the very definition of refinement. Note the fine details of contrasting background textures. Simple to color with Prolines new EZ-Accent water based stain and EZ-Tique, our water based Antiquing system. This pattern consists of 4 separate parts for easy installation.