An 1898 South African Republic gold pattern "tickey" coin is valued at $50,000-60,000 ahead of a September 17 sale of world coins at Heritage Auctions.
The lot is graded MS63 and displays an exceptional lustre.
It was designed by mining magnate Sammy Marks. The coin is one of only 215 such coins issued, each of which is minted in 22 karat gold.
Heritage comments: "Light past handling defines the assigned grade, but no individual instance of contact requires attention; in fact, while we've sold finer graded examples in the past, this example, in our opinion, surpasses them all due to its dynamic character.
"A truly wonderful coin, befitting the finest South African cabinet, and certain to thrill its next owner one view after the other."
A 1902 South African Republic gold veld pond is expected to sell for $40,000-50,000.
The lot was an emergency coin issued during the Boer War and features a crude rendition of the ZAR (South African Republic) monogram.
Despite the clumsiness of its execution (the engraver had never been near a die before) it's since become an enduring symbol of South African history.
Please sign up to our free newsletter to receive exciting news about coins and banknotes auctions.