Big red stain on f103r and retouching of text

[Bluetoes101]

<f103r.6,+P0>    ocheey.dain.shek.okeedy.okey.shedy.qokealdy.shcthy.qotedy.qot.dy.ota[?].san.am

Sorry if this is something that's been gone over previously, or just incorrect. 
However the "an" of "[?].san" , looks like it was done in a different writing implement to my untrained eye

Might this help date some of the "retouching"? I might just be completely wrong, or its too little to make any conclusion on, but thought worth mentioning.