Coke lollipop base question

[Sodak Bob]

I posted a picture of this sign base I picked up a couple of weeks ago - here is my question.  I see some bases (like mine) have the words:  "Trade Mark Reg US Pat Off." under the Coca Cola while others have nothing. Does this date the sign or were they for different signs ?  Just wondering... Thanks   

[sodaworks]

The trademark bases are the real deal. The bases were repopped a few years back. I would think the bases without the trademark are reproductions.