This is a Royal Copenhagen Mini Plaquette plate featuring Frederiksborg Slot (Frederiksborg Castle). 

• Brand: Royal Copenhagen. 

• Location: Made in Denmark. 

• Marking: The "A" with three wavy lines mark (sometimes called a beehive mark) was used from 1903 to 1969. However, the number 2010 indicates a specific series number or model. 

• Material: Porcelain. 

• Feature: It is a mini plate, typically around 3 inches (8 cm) in diameter, and has a hole for hanging