Elgin Grade 315, "E.H."

This is a grade 315 Elgin. It is a 12 size, 15 jewel, movement made about 1911.  

This movement has "EH" scratched into the dust cover, near the winding arbor. It's not very neatly done, it's likely an owner and not a watchmaker's mark.

This is how customers bought watches at retail, way back when.

Elgin, like other American makers, did not make watch cases. The case was selected separately by the purchaser and the watch was "cased" at the shop.