Hi Reservist1 and K-B,
I have the same opinion about the chinstrap, and perhaps the kokarden. I have send an email to the seller, via eBay, asking if all the parts are original, here's the answer:
Response to Question about Item -- Respond Now
eBay sent this message on behalf of an eBay member via My Messages. Responses sent using email will go to the eBay member directly and will include your email address. Click the Respond Now button below to send your response via My Messages (your email address will not be included).
Response from boklung
Item: German / Prussian Pickelhaube - Spike Helmet (6582589614)
This message was sent while the listing was active.
boklung is the seller.
All original piece