I really think it\'s wood. I didn\'t notice the crack (it may be just a scratch as it crosses over the grain). Looking at it right now using the computer monitor as a backlight, I see actual wood grain inside the bell.
ZoeB, you must be into photography too if know a shallow DOF is

Maybe Selmer was ramping up production of Bundy\'s during a transition to Resonite.
Just slapping on Resonite stickers on any bell in the parts bin :-/