Ottoman Balkan Kalkan iron shield with brass coins Nuremburg

An interesting and ancient Turkish or Balkan shield 'Kalkan'. Composed of wood and woven fabric reinforced massively with iron mounts and adorned with bronze discs which appear to be coins or similar, some writing is visible but illegible. At the rear a woven leather handle still remains. This defensive buckler probably dates to the 17th or 18th century, it  survives in relic condition and is very fragile. Middle east