I found this Marble in a box of rough gem stones I bought at auction awhile back.. I don't know much about marbles but I'm pretty sure this had a pontil scar an is hand blown..possibly from German...
https://i16.photobucket.com/albums/b17/creeper71/2010_0616ribbonmarble0019.jpg
https://i16.photobucket.com/albums/b17/creeper71/2010_0616ribbonmarble0015.jpg
https://i16.photobucket.com/albums/b17/creeper71/2010_0616ribbonmarble0020.jpg
https://i16.photobucket.com/albums/b17/creeper71/2010_0616ribbonmarble0016.jpg
https://i16.photobucket.com/albums/b17/creeper71/2010_0616ribbonmarble0019.jpg
https://i16.photobucket.com/albums/b17/creeper71/2010_0616ribbonmarble0015.jpg
https://i16.photobucket.com/albums/b17/creeper71/2010_0616ribbonmarble0020.jpg
https://i16.photobucket.com/albums/b17/creeper71/2010_0616ribbonmarble0016.jpg