To those who say there's no such thing as a stupid question, I plan to test that assumption. I recently purchased an older Gretsch Commander alto, which I "think" is a Buescher stencil. My question is what key plays the lowest B flat. On my Cannonball (top pic) the key to the left plays B flat. On the Gretsch (bottom pic) that key is tied into the top key and not on my Cannonball. On the Cannonball the top key is B and it is separate from the B flat. If this makes sense to anyone, please explain it to me. Thanking you in advance for any help.