The label calls the beer “US1.4 billion proof” a reference to the 1.4 billion in losses Mr.Leeson caused at Barings.
The beer is also called 88888 Reserve, after one of the account number the trader used.
Vocabulary
Novelty: special, for fun
Cases : boxes made to hold beer bottles
Proof : proof is usually a measurement of the alcohol content of beer , wine or spirits
In this cases it also refers to the large amount of money that Nick Leeson took.
Account number : the number of an account in a bank