This is a large silver plated sugar shaker, very popular at the end of the 19th century and  beginning of the 20th century when afternoon tea was all the rage. These casters were used to shake sugar on to your strawberries. This particular one is a thick silver plate and heavy body suggesting it would have been used in a hotel or tea rooms.
 
The silver plate is in good condition with no ware, and the shaker unscrew easily.
 
Dimensions: 17cm x 7cm