Hi Cerjak,
Thank your for trusting me that much but as I have stated various times, pieces of armor are not exactly my field of expertise.
Telling by your photos though, I would say the helmet looks very good and original; it reminds me of similar helmets which are part of late field armor (
Feldkürisse), Thirty Years War, in the famous Graz Armory; many of them were supplied by a Styrian maker in 1635, so a date of ca. 1620-30 seems quite right for your helmet.
It also seems close in style to a Savoy helmet.
I do hope this will help a bit.
Best,
Michael