Again congratulations mate, I did visit the site on Saturday 21st of March, the weather was very hot but unfortunately the view was masked by a heavy heat haze.
I could swear that I searched every crack in that damn pillar, and the trig point next to it.
My hand must have passed over the coin, but maybe since I am not very tall I could not see it.
I found the location from the distinctive meander in the river and its proximity to SWHQ.
I am sure the Mr White reference is just for confirmation that you are in the correct spot.
As for “a good cardio-vascular hike".....nearly cardiac arrest in my case.
So the moral of the story is, if you are vertically challenged, take a ladder when hunting Ramisis.