6 Blue & White mugs that look like enamel, but are actually china. EUC

These mugs stand 3.5 inches tall with a radius of 3.25 inches. Colour most accurate in photo of single mug. These would make great every day coffee/tea mugs. I’m assuming they are made in Japan or China, but there is no Hallmark on the bottom. All in excellent condition with no signs of damage of any kind.