In my 2002 Coins of Scotland, Ireland and the Islands book it says £250 Fine and £575 VF......Actually, looking again, it's £235 Fine and £525 VF because it has the revaluation stamp of 1578. You can't really call it VF (usually you never can with hammered!) and it does have some flan cracks. To be honest, even though I am no Scottish expert, I would tip that your grandfather had paid too much 50 years ago and that the value today is not much higher, perhaps even the same. What say thee 'Scottishmoney'? (a member here)