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This small silver wine label is a type known as postage stamp because it is similar in size and shape to a stamp.
This variety of label was first made in the closing years of the 18th century and was popular for several decades. This example for 'S' was made by Charles Reily & George Storer in london in 1840.
Initial labels were often for spirits - presumably because spirits were not something to boast about. the most common initials are G, R, W & B for Gin, Rum, Whisky and Brandy. S may have been for Sherry or Shrub (a popular cordial).
Dimensions: 9", 24 mm wide
Weight: 10 grams