A fine pair of antique mugs to commemorate the Silver Jubilee of Queen Mary and King George, 1910-1935.  In beautiful condition with no chips or cracks, just a few nibbles on the base and a little age-related crazing if you look carefully.  The silver rim also has some fading in parts but otherwise is intact.  
One is slightly larger than the other but otherwise they appear identical.
Smaller: Height 7.5 cm, Diameter 7.5 cm
Larger: Height 8 cm, Diameter 8 cm