A friend just bought an OS73C Black box 'harp at George's Guitars in Cobourg and she's loving it. I've only seen it on Facebook, but it looks great.
I love the looks of the old A models with the square corners and have a couple of Appalachians and a black box from the mid-sixties.

Bob, I wish we lived a little closer (I'm in Port Hope). I'd love to get together and play some tunes.