Franco-Prussian War German Franco Prussian Era, 4 Iron Cross Markers, Door Pulls?

Item #59413 : Original era manufacture. German Franco Prussian Iron Cross spiked markers. Set of 4. Not quite sure of their original purpose, the three larger examples have an 1870 dated EK type design on their fronts, with a a nail-spike on the reverse. The three larger measures 38 mm across, the smaller one 22 mm.