The No9 site is actually AG Parker; so fit's in quite nicely with the rifle that's 1929. I paid 50 pounds for the sight plate. I believe it is also marked Parker, but I'll have to confirm that.
I had started making one from scratch when this one turned up! so I was lucky.
Alot of these sights and bit's are locked up in collections these days; it's so much nicer to get them back on a rifle!