The Dutch Galliot (in Dutch galjoot) a coaster from the 17th till 19th century used in the mercantile marine of the Netherlands, Germany-Belgium-France-Great Britain and the Baltic States.
Some were fast and lean and heavily canvassed used as “advice boats”, and were used by the Dutch in the navy and East Indies.
The type did look somewhat like a koff.
She carried also the mail and passengers between the Netherlands and England.
The small once carried leeboards, like the one on the stamp.
Bluff rounded ends; flat floors; flat sides.
Mostly decked with a deckhouse in the amidships and a cabin aft.
Carried an outboard rudder with a tiller.
The smaller were also used for fishing and did have a fish-hold in the amidships.
Dim. length 18-30 metres, with a deadweight from 160 till 500 ton. A 1830 vessel was 27 m. long 7.2 wide with a depth of 3.8m., shallow draught.
In the 17th century carried a standing gaff mainsail and numerous headsails. Long rising bowsprit.
By the 19th century ketch rigged with a gaff or lateen mizzen.
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Source: Zeilvaart Lexicon. Aak to Zumbra, a Dictionary of the World’s Watercraft.