The Vintage KLM Business Class Delft Porcelain 3" Square Drink Coaster Tile set of 4 is a collectible item associated with KLM airline from the 1908's.  Made in the Netherlands, these coasters feature a traditional Delft design. Depticts windmills, a boat and boys playing leap frog. (Not like the one in the movie "The Birdcage).

From a smoke free home.