The Maple barrel possesses a few eyes about the call and which the photo doesn’t portray, as well as a unique grain orientation.
Regarding the insert- it is the nature of Osage Orange wood to darken ever so slightly over time, giving way to the undertones of a slightly orangish hue. It’s one of the beauties of this type of wood. No worries however, although subtle, the slight color shift is miniscule and will always possess that yellowish-orange hue. Only darkens so much. It’s just outstanding wood.