Sir Patrick's link is very close. I'd also guess Depeeka.
It's still different in the lack of brass, yours has a plume holder, and yours comes to a sharper point in front and has a rolled lower instead of flared. Yours also has a locking pin instead of a sneck hook. Few other differences. Might be an older version, or some random armorer modified a pattern and made their own variant.
I agree it doesn't look overly historical. I don't remember seeing any earlier helms with plumes; crests / mantle / torse, yep, but not a plume specifically. Prior to my specific century or two of interest, though.
It's a fairly unique helmet.