These this is a handy wee group of Clupea teacups by Figgjo Flint.
They are handy as replacements or spares for your set.
Each larger teacup measures as follows: Height 2 1/4 inches. Diameter at the top is just under 4 inches. The diameter of the base is 2 3/4 inches.
The three are in good vintage condition with no chips or cracks.
The price here is for all three dishes as photographed.