The Collaborative International Dictionary of English v.0.48:

Smithery \Smith"er*y\ (sm[i^]th"[~e]r*[y^]), n.; pl. -ies
   (-[i^]z).
   1. The workshop of a smith; a smithy or stithy.
      [1913 Webster]

   2. Work done by a smith; smithing.
      [1913 Webster]

            The din of all his smithery may some time or other
            possibly wake this noble duke.        --Burke.
      [1913 Webster]