Forum adverts like this one are shown to any user who is not logged in. Join us by filling out a tiny 3 field form and you will get your own, free, dakka user account which gives a good range of benefits to you:
No adverts like this in the forums anymore.
Times and dates in your local timezone.
Full tracking of what you have read so you can skip to your first unread post, easily see what has changed since you last logged in, and easily see what is new at a glance.
Email notifications for threads you want to watch closely.
Being a part of the oldest wargaming community on the net.
If you are already a member then feel free to login now.
They're probably lot numbers of some sort. I work in a factory (although we make juice) and we have numbers for things like telling us which lane the pouch is from as well as which filler the juice is from. The numbers very well could be indicating to the people working there which machine was used to mold it (as well as which factory it's from, I don't know if they have multiple factories with the same molds).