An improbable exchange
From Fallen London Wiki
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From: A Presumptuous Little Opportunity
At the back of the shop, in a glass case, sits an ivory bottle with a label in the complex Hudum script of the Khanate. Even the Sommelier winces when he names the price for it. "Specialist tastes," he adds defensively. "Take it or leave it."
Unlocked with 
5 x Cellar of Wine
Success
An eye-watering price
[…] Servant after servant troops past, carrying your precious bottles into the depths of the shop. Finally the Portly Sommelier hands over your bottle […] 'Here,' he says, 'lagniappe.' He drops a little satin bag into your hand.
Description summary:
The Sommelier's servants take your wine. The Sommelier gives you a gift as well as your Airag.
[Find the rest of the story at https://www.fallenlondon.com]
You've gained 1 x Bottle of Fourth City Airag: Year of the Tortoise
You've gained 5 x First City Coin
You've lost 5 x Cellar of Wine
