I just found mine it's in the tray part on the back left it starts with a letter and also has a bar code
But from this link no serial number required:Hi Guys... I feel silly even asking this question... And will probably feel even more silly when you give me the answer... but... Where is the serial number located for my Graphtec 6000? I want to download the studio software but i need my serial number... i looked on my cutter but dont see it. No one else seems to have asked this question here or on the internet so... i am sure it is just me... Thanks in advance, Shallena
http://www.graphtec-ss.jp/dl/cm4/cm4_std_en_w.html