Not saying it is good or bad, but got to love the description!!
http://cgi.ebay.com/ORIGINAL-WWI-CHINSTRAP-FOR-PICKELHAUBE-HELMET_W0QQitemZ110504798044QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item19ba99675c
"This strap came off a damaged helmet but I am not positive if it is original or not as it is in such good condition! Guaranteed original. "
http://cgi.ebay.com/ORIGINAL-WWI-CHINSTRAP-FOR-PICKELHAUBE-HELMET_W0QQitemZ110504798044QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item19ba99675c
"This strap came off a damaged helmet but I am not positive if it is original or not as it is in such good condition! Guaranteed original. "