i am totally irrelevant with armors and i wanted your help for a helmet identification. I acquired from my grandfather a strange helmet that i always thought that it must be an ottoman period helmet but never searched for more information about it. Can anyone please help me with its identification? i also would like to know how i can clean the rust from it and its value. The helmet logically is from Greece, i didn't have the chance to ask my grandfather about it, he died two years ago.

