Handmade in EU by a family-operated company, one of the last 2 or 3 European ones still making enamel cookware as sturdy and versatile as it used to be, and you will feel it by their weight and the thickness of the multiple enamel layers on their steel core. Three prints can be found on the mug.
These dish washer-safe mugs can be used on gas stoves, induction cookers, open fires and ovens, and can be also put in the fridge or freezer. Just remember they are made of steel and metals and microwaves don't go together.