E.C. Stearns C clamp

 Here is a nice plain C Clamp from the company, their regular line was hardware, auger bits and other tools, they also manufactured a line of very nice eccentric clamps, I've never seen one in real life..

 E C Stearns was a machine manufacturer located in Syracuse NY. The company started in 1864 and aside from hardware and tools,  branched out in several directions at different times, bicycles, steam cars, typewriters and others. One division manufactured the Knight sleeve valve engine. the company appears to have been bankrupt in 1956. Company history here.

1924 catalog here.