Thanks for the feedback. The bottom of the L and U is actually a result of either Mechanical Doubling and/or Die Deterioration. It is flat and not raised, so it would not be considered true doubling. This link talks about this and in the third paragraph talks about notching. Someone with more knowledge may be able to explain notching in better detail as to how or why it happens.
http://doubleddie.com/144822.html
http://doubleddie.com/144822.html


























