The "In God" certainly looks doubled, has the split serifs. Not an ugly coin either. Do I see a really obvious split on the B of liberty?
I don't know. You're close and headed in the right direction. It looks more like reflection to me. Check these areas again...
Have no fear, the best in varieties is here .. LMAO .. http://varietyvista.com/12 Kennedy Halves/DDO Detail Pages/1973DDDO005.htm
Pay attention to the markers on #5 . Now look at the OP coin . Markers: Die Scratches Running Northwest, On Obverse ...
Camera plays hell with shiny coins especially with big letters. It looks to me that the MM on yours is out of place or too low compared to examples....I got lucky with a few halves but I am no expert at all. Take another angle of anywhere you "see" a split. Try different lighting. The split can be a digital image due to reflection and glare.
Rick...you are the expert with these by far. Does the mint mark look like its in the right spot or am I just seeing it wrong????