Clown's Severed Hand is a quest item.

A severed hand with a ring on a finger. The ring was smelted with a grinning face on the band.
Properties
Miscellaneous Items
Rarity: Story Item
Weight: 8 kg / 16 lb
Price: 1 gp
Where to find
Can be found on a plate at Popper's store in the Circus of the Last Days.