Keep Calm (& Carry On) You're 18 - 18th Birthday Fine Bone China Mug by Leonardo is 3.75"/9.5cm tall, with a 3.5"/8.5cm diameter, carefully crafted out of fine bone china by Leonardo and comes in handsome matching gift boxing. Originally taken from the WWII Ministry of Information "Keep Calm & Carry On" posters now this phrase has become an inspirational & iconic saying and makes a whimsical 18th birthday gift.