I'm sorry for bumping this thread, but I was quite amazed to see this medal here.
It so happens I was reading an old book about Friesian (=Dutch province Friesland) history the other day. There's a small story in it about an old Waterloo veteran Gerhardus Portegies who was then living in the city of Bolsward.
He was born in 1779, only a few kilometers from where I'm living now, and there's also a record on him in the National Archives in Kew:
http://discovery.nationalarchives.gov.uk/details/r/C13321390
So how interesting to see his medal turned up! I've done some more research on this person, even found a letter in which he writes about his time in Spain during the Peninsular War.
It would be great if somehow I could get in touch with the current owner and perhaps get a better picture of the name Portegies on the medal.