The artist is Michelle Carlisle, group is Blackthorne, CD is Singing in the Travels. I love how she sounds! Thanks, John.
She responded that she didn’t know, she bought it a long time ago at Dusty Strings. Might be a Sweet but the decal is worn off. Oh well! J.
From the pix on their website, it looks like she plays mostly a silver Boehm flute.
Not a close up photo, but I’d say it looks like a Sweetheart.
Not very high quality, oh well, J.
Didn’t most of the older Sweets had the heart/S burned or pressed into the whistle – and only recently did they used stickers?
I do admit any whistle knowledge of mine is less than six years in the making … 
It does look wood…
-Casey
Dusty Strings does carry Sweetheart whistles… I’ve seen and tried 'em there. FWIW.