What is the value of a Reigersdaal Wreck 1736 Philip V MF cob?

I recently purchased a Silver Ducatoon which was said to come from the wreck of the Reigersdaal off Cape Town in 1747. The cargo it was carrying at the time of the wreck was coins from the Spanish mint in Mexico showing Philip V, but the coin I purchased is dated almost 100 years earlier (1651) and shows the head of Philip 1V. I paid GBP95