Vipper, do the service manuals note any changes to the main plate for the hair spring protector?
Thanks
Some history to ponder:
marcello pisani comments (though untouched is subjective)
http://www.network54.com/Forum/207593/thread/1239909949/5513+Movement+Question
Notice this one does not have hair spring guard pin slot in the main plate:
http://www.network54.com/Forum/207673/thread/1281104094/FS-+GMT+6542
Diego M. posted a 665,XXX 1005 with a 1560 with butterfly rotor. Notice it does not have hair spring guard pin slot
http://www.network54.com/Forum/207593/thread/1314387160/Cal+1560+Question
Another one see Tomvox1 posts
http://www.network54.com/Forum/207593/thread/1295557169/Calibre+1530+Chronometer+-
Another with various confusion lol
http://www.network54.com/Forum/207593/thread/1289577728/the+right+rotor+for+the+1560-
CD