Hello guys, I have bought a new old set (2nd hand) made by Arye De Keyser. The chanter has 4 keys: Cnat, Bb, G sharp. I am not able to recognize the last one key. Can you help me, please?
Here you are the chanter key position:
The very fisrt one, on the right side on the back D.
F natural
Me see three d key
RORY
The keys are, from bottom to top: F nat, Bb, C nat, top D (octave above back D).
There is no G# key on your chanter.
Yip. Looks like a third octave D key.
I agree with Michaeloos.
Yes, you are right: typing error for me!
So it could be top D. Thank you guys 
On some chanters this “high d key” also serves as a second-octave C# (better in tune than non-keyed alternatives for 2nd octave C#). It’s worth a try
Bill
Yes, it is the 3rd octave d. However, billh, I have gived it a try for the c# and it sounds quite good in the second octave. Thank you for your help!
All the best! 