Sell the right-hand side
From Fallen London Wiki
This page contains details about Fallen London Actions.
The postman still won't call. Best to sell the thing.
Game Instructions: It will fetch Muscaria Brandy.
Unlocked with 1 x Screaming Map: Right-Hand Half
The Sulphuric Zailor has your map-half, and you have his brandy. You can't help but wonder about Hell's interest in Polythreme. They normally don't give a rat's curse about the Clay Men.