Thanks Thanks to imxwhite and Duran for most of the info here.

Helmets

Image Name Buy Sell Def Apr Who Found Description Cursed
No Artwork Yet Eggshelm 0 5 1 Chest in Secase Seacove, Lucky Bag
No Artwork Yet Great Helm 8,800 0 32 Travellin' Merchant
No Artwork Yet Hardwood Headwear 160 80 6 Armour Shop
No Artwork Yet Iron Helmet 1,150 575 10 Armour Shop
No Artwork Yet Iron Mask 2,800 1,400 15 Travellin' Merchant
No Artwork Yet Leather Hat 65 32 3 Armour Shop
No Artwork Yet Platinum Hedgear 0 2,850 22 N/A
No Artwork Yet Liquid Metal helm 0 0 Comes from King Latem the first time you beat him