Keep Calm  Suggested by fonatica 


Keep Calm And Type On  Suggested by marijnkampf 

Alternatively you could use the Keep Calm and Type On font from http://www.keepcalmstudio.com/font. It has both the crown and the upside down crown included. I've specifically designed it to match the font from the original Keep Calm poster. Or if you just want to create a poster you can make them for free on www.keepcalmstudio.com.