How much is a 1969 Proof Krugerrand worth?

As the value of bullion Krugerrand coins is very much tied to the price of gold it is difficult to determine the price of a 1969 Proof Krugerrand. However, a good estimate for a 1969 Proof Krugerrand would be about 110% of the gold price.
On the 29 May 2016 a 1969 PR66 Proof Krugerrand was sold on ebay for US$ 1882 which would be around 140% of the gold price.