HP Restore +600
Required pirate level: 72
Obtained by synthesizing Ace's Hat Blueprint(50 fragments to make one, costs 1500 beli) +1 Mihawk's Cross Pendant +1 Shichiseiken and costs 36000 beli.
Ace's Hat Blueprint Fragment can be obtained from Adventure mode normal or elite missions:
There are currently no missions where you can obtain this from, but maybe you can get lucky enough to obtain them through Arena, Takoyaki Store, Level 5.5 Store, or Grand Line. Otherwise, you will have to wait until more chapters are released.
Ace's Hat has a rare chance to spawn in the Arena/Grand Line store, and costs 8021 arena/grand line coins.