Just FYI, it was a limited run of 250, including both 4 and 5 string models. I'm guessing that it says 05/72 on the back of the headstock, which could be interpreted as number 5 of 72. However I believe that it means that it is the 5th Ltd Ed Series, and the 72nd instrument of that run. Mine says 05/12. If you search on google you can find 05/188, 05/25, 05/150, etc.
Lots of people get confused by the way they used to number the Ltd Ed basses, so they changed the numbering system a couple of years after this bass came out.