Vintage Knife Carborundum Silicon Carbide Sharpening Stone 108 8 " X 2 " X 1 " USA

Vintage Carborundum Silicon Carbide Sharpening Stone 107 & 109 Indian Usa

Vintage Carborundum Silicon Carbide Sharpening Stone 109 Indian Usa

Vintage Carborundum Silicone Carbide Sharpening Stone 138

Vtg Med Carborundum Silicon Carbide Sharpening Stone Box 131 Niagara Ny

Vintage Rexite Brand Silicon Carbide Sharpening Stone

Vintage Carborundum Brand No. 108 Silicon Carbide Sharpening Stone 8 X 2 X 1

Vintage Carborundum 328 8”x3 " X1” Silicon Carbide Sharpening Stone - Box