Gold Crown III question

[gromulan]

I am thinking of buying some used Gold Crown III's. There is a sticker on the bases that identify them as such, but there's also what appears to be a manufacturers sticker with nothing but "DLK" stamped on it, instead of model number and so forth. Does anyone know what that means?

Here's a pic...

 

[mechanic/player]

That is a code for the stain used to color the table.