Contributor 
WALTER PERRIN
Apparently there were 7 of these Countess type "A"  yachts produced around 1963 of John Alden design and were constructed of with wooden frames and a fiberglass outer skin with plywood decks instead the balsa core type.
It was produced as a sloop only and the mast was stepped on deck.
MODEL 989-A & 989-ST
The Model 989-ST was produced as a Ketch.
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