Green’s Dictionary of Slang

Flanders n.

used in combs. stereotyping the Dutch as mean, hypocritical or deceitful.

In compounds

Flanders piece (n.)

a painting that looks good from a distance but not so good close to.

c.1698
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1760
[UK]B.E. Dict. Canting Crew n.p.: Flanders-pieces, Pictures that look fair at a distance, but coarser near at Hand.
[UK]New Canting Dict. [as cit. c.1698].
[UK]Bailey Universal Etym. Eng. Dict. [as cit. c.1698].
Flanders reckoning (n.)

spending money in a place that has no links to the place where one received the money.

T. Heywood If You Know Not Me, You Know No Body (1874) I 271: Spend it! God send me but once to finger it, and if I doe not make a Flanders reckoning on’t – and that is, as I haue heard mad wagges say, receiue it here, and reuell it away in another place.