Leather is dry and shrunk, metal spike and front crest are loose. The crest appears appears to be missing the crown, but if it was broken off it's a clean break.
Didn't know it was supposed to have one until I checked online. Stamped into the leather at the RR corner of the neck protector is 19 J. " Has a "56 ink stamp inside top of helmet. Also a square ink stamp that has (I think, it's hard to make out) 147 B.
The item "WW1 German Bavarian Pickelhaube spike helmet" is in sale since Tuesday, December 19, 2017. This item is in the category "Collectibles\Militaria\WW I (1914-18)\Original Period Items\Germany\Hats & Helmets". The seller is "militaryship" and is located in Tempe, Arizona. This item can be shipped worldwide.