During the Academy Awards broadcast Jimmy Kimmel mentioned that Robert Downey Jr learned to play the violin left handed for his portrayal of Chaplin. Quite a feat, I'd imagine, and not at all concertina related.
Wikipedia has an interesting page about Ora (or Aura) Lee. I had to listen to your video again, Jody, to hear Elvis' Love Me Tender. Nice song, Ora Lee!
https://en.wikipedia.org/wiki/Aura_Lea
Shopgoodwill.com mostly shows inexpensive, Chinese/Italian made 20 button instruments. Occasionally, an EC or good quality 'tina appears, so look regularly!