Well the 1900 vintage Joseph Wallis whistle arrived today. It is indeed as anticipated in the key of G, and about 2/3 the size of my Copeland brass D, looks like someone put the Copeland in the dryer on high.
I’ve tried a friends Generation G, its much more shrill and painful to listen to than the old brass whistle… This one is pretty mellow overall, doesn’t get annoying until you get to the upper end of the second octave…