I was drawn to this because it look like red liquorice. I photographed it and, only when editing, did I notice the B + D marking inside. It's so unique, of course it was!
Inner diameter measures 2-1/2" x 1-3/4 (very narrow) x1-1/4" in height. I have small wrists and fairly small hands and this was tight to get on.
In excellent vintage condition but please note, it does look like some fool did a hot pin test on this so there is a small indentation. Please see 6th photo (the left side of the bottom half). Priced accordingly.