The LH pinky keys don't look like any Conn I've ever seen. They look more like the Buescher design like VintageSaxGuy said.
Also, though it isn't really relevant to this particular case, it is possible to find 6Ms with the overslung neck - it was called the 'New York' neck I'm pretty sure. For example: This horn
Also, though it isn't really relevant to this particular case, it is possible to find 6Ms with the overslung neck - it was called the 'New York' neck I'm pretty sure. For example: This horn