FabricWhen describing a coin, fabric refers to the flan characteristics: metal composition, thickness, edges, concave or convex faces, etc. Fabric may be important in determining the denomination, date or authenticity of a coin. Also see: Doug Smith's Fabric page | FabricWhen describing a coin, fabric refers to the flan characteristics: metal composition, thickness, edges, concave or convex faces, etc. Fabric may be important in determining the denomination, date or authenticity of a coin. Also see: Doug Smith's Fabric |