Obviously it is difficult to tell just from pictures, but it is likely to be unused because it is (probably) of modern Indian manufacture. The detail on it does not really look that sharp. I would think the originals were (probaby) made from copper and given a silver plating. The captive bolt for fixing the eagle to the skull looks a bit large and clumsy for the inside of a helmet too.
Books published to date... 'Belfast Diaries: A Gunner In Northern Ireland'... 'A Tough Nut To Crack - Andersonstown'... 'An Accrington Pal: The Diaries of Pte Jack Smallshaw, September 1914 To March 1919'.
PrussianGloryMilitaria sells the crowns, in case you were looking for a replacement...
Like Harry said a Indian copy to me too!
Originaly made of tombak.
With officers model base plate!
Always looking for Belgian Congo stuff!