Don’t know if anybody might be interested, but there are two 1920s whistles on ebay (auction to end 4/6/02-in about 12 hrs)(item #855049733). I don’t have any spare $ for more whistles right now, but they might be fun for someone’s collection.
Susan
I wrote the seller for more info but didn’t get much. No maker’s mark and they came from Pennsylvania.
The green one looks bigger, and I don’t think it’s perspective. I’d guess D and C, but I do have a couple of old-timers that don’t quite fit any standard key.
Might’s well put in a bid and see what happens.
Best of luck then as I had pondered bidding but hubby says what with whoa and daughter’s Recorder over acquasition his head is screwed. Can you tell he’s not really musical? 
Got 'em, now the wait to see just what I got.