The Collaborative International Dictionary of English v.0.48:

Hamburg \Ham"burg\ (-b[^u]rg), n.
   A commercial city of Germany, near the mouth of the Elbe.
   [1913 Webster]

   Black Hamburg grape. See under Black.

   Hamburg edging, a kind of embroidered work done by
      machinery on cambric or muslin; -- used for trimming.

   Hamburg lake, a purplish crimson pigment resembling
      cochineal.
      [1913 Webster]