It's a code used in the store room of a toy store.
Let's say Argos for example, above or at the back of the store there would be a warehouse/stock room, the first part of the code normally relates to the section, then the last part is the item number in that section.
I would imagine its just an old toy warehouse sticker
*They still use this method
Edit - It can also relate to the item number in a catalogue
(you know when you fill out those little silly pieces of paper in argos with them stupid pens that the kids steal