Blue Onions, Fine Bone China, Vintage Coffee Cups (set of 4)

These are very nice cups for the coffee drinker. They have the blue onion pattern which is very intricate. On the base of the cup is Blue Onions Vintage Coffee Cups, Fine New Bone China, Product of China. They are in new condition and hold 10 ounces of liquid and are approximately 4 inches tall. I cannot find any other information on these cups.