Brewer's: Flemish Account
A sum less than that expected. In Antwerp accounts were kept in livres, sols, and pence; but the livre or pound was only 12s. In Notes and Queries we have an example of a Flemish account, where £373 Flemish becomes £213 2s. 10d. English.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894