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mpbird,
I thought that you wanted our opinion as to whether the missing Obverse details were done at the Mint or Post-Mint (man-made manipulation)! My fault for not reading your post better!
To answer your original question, who knows the reason why! You would have to know the person that milled out the Obverse of the coin to know, that is if they were willing to devulge the reason. They may have been experimenting on ways to mill out the details on a coin to make it appear as an error or just goofing around. As they say, "idle minds and hands make for idle work or play".
Frank
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