GhyslainB could tell you where he found this object and possibly what software was used to design it.There must be a problem with double sides or with normals in the Mantle Clock.
When you remove normals from OBJ files (remove the last [font=courier new]/vindex[/font] in the triplets of the lines starting by [font=courier new]f[/font]), or when you import / reexport the model in Blender, the parts of the clock which are rendered in black aren't black anymore.
Which software was used to design it?
By replacing the textures with colors for the problematic materials (material0, material6, material9), I get this result.
