Wow--this is a fantastic color. It is Boyd's cobalt slag. This swan is signed with the third Boyd mark, which indicates it was made between 1988 and 1993.
The color is a deep cobalt with white milk glass swirl. The swan measures approximately 3-1/2" X 2" and has a long neck with its head elegantly tipped to one side.
What a nice swan to add to your collection.