Watch List notes:

Mary, one-third ryal, fifth period, Second Widowhood (d. 1567), crowned shield, thistle each side, MARIA DEI GRA SCOTORVM REGINA, rev. tortoise climbing a palm tree, DAT GLORIA VIRES on scroll, EXVRGAT DEVS ET DISSIPENT [ ] IVS (double struck), crowned thistle countermark of the revaluation of 1578, wt. 9.81gms (S.5431), clearly struck over another coin, rare, surfaces tooled, otherwise good fine
*ex DNW, 16/09/2020, lot 65, purchased for £1,109
This obverse die has a fleur-de-lis in the top right hand corner of shield and in the middle of right hand side below lion's tail
Obverse die not recorded by Rampling; see 'The Silver Ryals Coinage of Mary, Queen of Scots' by David J. Rampling, JNAA vol. 27, 2016

Estimate: 700 - 800 GBP