This is an unusual set of four 6" x 6" glazed fireplace tile with a mark on the back that we have not been able to identify. The set features the eagle which represents the German state of Bavaria with the coat of arms depicting two crossed keys which represents Regensburg, the capital of the Upper Palatinate and the largest city on the Danube River. Regensburg is the fourth largest city in Bavaria. 

These fireplace tiles are in good condition with some staining to the white portion of the tile and crazing in the glaze. There is a crack in one tile which is shown in the photographs. While it is difficult to date these without knowing the manufacturer, the style and size lead us to believe they are from the period between 1870 and 1900. 

We have another set of three tile from the same unknown maker which depict landscapes and landmarks around Regensburg, please see that listing here.