William & Catherine Royal Engagement Collectible Box To celebrate the engagement of HRH Prince William of Wales to Miss Catherine Middleton – 16th November 2010. The bottom of this collectible box says, «Halcyon Days Enamels England.» Made by craftsmen in Bilston, the traditional 18th-century center of enameling on copper. Prized by collectors all over the world as items of taste and as small works of art; they are the antiques of tomorrow. This collectible comes in a decorative gift box with a fabric foam lined insert to better protect the item. This piece is approximately 2 1/4″ in diameter.