Vintage souvenir brooch from Mainau Germany

This beautiful brooch has two flowers with mother of pearl inlay and rhinestones on a gold tone setting. The leaf reads "Insel Mainau". Mainau is known as the Flower Island in Lake Constance in Germany and has been a park since about 1930. I'm unsure of the age of this stunning piece, but my educated guess is that it is from the 1950s.