Or relating to
Flügel (I read this as "wing of 15137 transferred to W.Nr. 15121"). Here joining two (wrecked) to make up one flyable. Just a guess of course.
Furthermore, lots of the original and possible re-paint is simply gone. This is weathered away. So wing likely was stored outside for considerable length of time. I think if there was US star there, is likely weathered away.
See this image 2nd link below (I belive is from Wright Field) the Left Wing has been replaced. As complete Bf 109 novice, this strikes me somehow as related.
Note US Star still on the Right Wing. There also be one on left wing, per prewar standards, as these were often seen on captured examples - it was common to paint US stars on both wings, just to be shure it is noted?!
http://i104.photobucket.com/albums/m...SAC/Bf109a.jpg