Personally I think they are full of shit, dial has clearly been messed with, more likely a complete fantasy. Why does the dial have a London reference when the extract says it was delivered to South Africa, why is there no mention of it being a chronometer on the extract, what's going on with that horrible blue 24 hour scale printed next to a faded red one? Should something this early be marked Swiss Made on the dial?
But hey, they may find a sucker to snap it up at their bargain price of $20K.