Definitely repainted. This was the standard German helmet in WW1, first introduced in early till mid 1916. Under the scratches looks like light rust. You can check with a magnet to see if it is iron, which I'm sure it is. It still has the correct swivel fittings for the chinstrap (these could be brass, as used till 1916), take care not to lose these. Someone has replaced the liner band with some old leather.
This one I got recently for our local museum, it cost about half of what is normally paid nowadays, as it is no longer in "top" condition, but still has all original fieldgrey paintwork and the leather lining, which is damaged, but complete.
The prices for these helmets have risen considerably in the past years.
Leather liner is damaged, but nothing missing, apart from the chinstrap
Check to see if there are any stamped markings on the inside towards the edge as in picture below.