Cast Iron Level by L S S Co., Athol Mass USA

Black antique cast iron level with 3 bubble lenses (1 level in middle and 2 plumb at each end). Marked L.S.S. Co., Athol, Mass USA. LSS Co. stood for L. S. Starrett Co. Has a groove along bottom side (which I have showing as the top) for leveling pipe. Measures 12" x 2" x 7/8.