i've been thinking about this for a while. only the freestylers had a number stamped on them.
Im trying to find out what year/month they started stamping the frames. There's no code in there to show what year/month they were made, the numbers to short.
It will be case of how many unstamped frames they made and in what year/month. then how many standard FREESTYLERS were made, how many GL PLUS frames and how many LIMITED EDITION frames. not sure if the neon frame sets had a new start number.
Im sure each new model had a new fresh start on the frame numbers.