It could probably be restored but it displays well. Some stitching is loose on rear visor and it looks like one of the inside washers has been replaced. The spike is original to piece but may have polished it has no fine scratches at all and looks to be made of silver.
Rest of helmet has beautiful original patina. The front eagle plate is loose but has original loop fasteners, with leather holding it onto helmet. Metal chinstrap is beautiful with original leather backing. The leather liner is complete and leather is still supple. Please feel free to ask any questions as these types of helmets are not my area of expertise.
Come to think of it, no helmets are my area of expertise! The item "100% Original WW1 Era German/ Prussian Spiked Helmet, Pickelhaube" is in sale since Monday, May 16, 2016.
This item is in the category "Collectibles\Militaria\WW I (1914-18)\Original Period Items\Germany\Hats & Helmets". The seller is "amycreegan" and is located in West Warwick, Rhode Island. This item can be shipped to United States, to Canada, to United Kingdom, DK, RO, SK, BG, CZ, FI, HU, LV, LT, MT, EE, to Australia, GR, PT, CY, SI, to Japan, to China, SE, KR, ID, to Taiwan, TH, to Belgium, to France, to Hong Kong, to Ireland, to Netherlands, PL, to Spain, to Italy, to Germany, to Austria, RU, IL, to Mexico, to New Zealand, to Switzerland, NO, SA, UA, AE, QA, KW, BH, HR, CO.