Frank,

I have a book on Shipwrecks and salvage in South Africa. There were only two wrecks on the South African coast in 1782.The wreck you mention was the British vessel of 729 tons called the Grosvenor in the service of the english East India Company. It was wrecked in the big gully to the north-east of the Tezani Stream, near Port Grosvenor in Pondoland, on 4 August 1782. The only other ship wreck on the South African Coast in 1782 was a vessel called Le Victor which was a French corvette of 16 guns.

The Grosvenor is referred to in my book as "The English East Indianman Grosvenor".

I hope this helps. If you need any more info let me know.

Regards Laura