See https://forums.chiffandfipple.com/t/fs-alba-low-g-standard-sold/87492/1
I presume this is the G between high d and low D, is it?
It is!
Aha. I have the low low A Alba, almost an octave below this whistle of yours. It’s superb. I wondered if this might be the G below my A, but clearly not. Still worth considering …
Don’t think Alba do a low low G!
It would be one helluva beast if they did! 
If you asked Stacey for a low, low G she might consider it. She always seemed willing to experiment to me.
SOLD