A "bezaan" is a type of sail that is attached to the mast at one end, with a small wooden "gaffel" at the top and a longer "giek" at the bottom.
It is called "gaff-rigged" in english, which shows these terms were quite international.
The "Mary", which was presented by the Dutch East India Compagny to Charles the same year, had "square rigging".
The rigging of modern sail yachts looks more like the Bezan.
There's an interesting list of Charles Yachts at http://www2.friend.ly.net/~dadadata/kemp/dictWXYZ.html
30 Jul 2005, 10:22 a.m. - Pedro
Bezan v Jamie.
From Antonia Fraser...
The Royal brothers took to racing their craft against each other with zest...There was a race between the dutch-built Bezan and the King's yacht Jamie (named for Monmouth), which the former easily won.
13 Aug 2008, 12:17 a.m. - Terry Foreman
The Bezaan was a Dutch pleasure yacht built in 1630 and presented to King Charles II by the Dutch East India Company. The Bezaan was about 15 feet long with a single mast and carried a crew of two, and was the precursor of modern leisure yachts. http://www.probertencyclopaedia.com/cgi-bin/res.pl?keyword=Bezaan&offset=0
13 Sep 2014, 11:24 a.m. - Bill
The fleet had another addition this year  in the Bezan, a small yacht; length of keel, 34 feet; breadth, 14 feet; depth, 7 feet; draught, 3 feet 6 inches; she came from Holland and was given to the King by the Dutch, but exactly by whom, is not recorded.
---The History of Yachting,1600-1815. Arthur Hamilton Clark, 1904.
13 Apr 2018, 8:38 p.m. - Sjoerd Spoelstra
The list of yachts has disappeared.
Here is a picture of the Bezaan from 1661
which shows she has gaff rigging.
Chart showing the number of references in each month of the diary’s entries.