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.