This is a Royal Copenhagen "Aluminia" Faience miniature collector's plate, also referred to as a "plaquette" or "butter pat". 

• Manufacturer: Royal Copenhagen

• Material: Aluminia Faience

• Mark: Features the "beehive" mark with three wavy lines, used from 1903 to 1969.

• Design: Depicts "Vor Frelsers Kirke" (Our Saviour's Church) in Copenhagen, Denmark.

2 copies, both Royal Copenhagen- different marks on the back, same location