Georg Jensen Sterling Silver Very Rare Sugar Caster No. 683 by Oscar Gundlach Pedersen. 

Designed and made in the 1930's. 925S.

A similar example can be seen in the book GEORG JENSEN HOLLOWARE, The Silver Fund Collection by David Taylor and Jason Laskey, pg. 239.

Designer: Oscar Gundlach Pedersen
Maker: Georg Jensen
Design #: 683
Circa: 1933-1944
Dimensions: 5.5"H x 2.25"D
Country of Origin: Denmark