Google is possibly testing a new ad label, this one goes back from the black "Ad" text, to a green outlined "Advt." label. This was shared to me by JaiKishan Raturi on Twitter, here is the screen shot.

We know the green ad label was showing to a limited number of people after it switched to the black ad text label.

We have also seen the black ad text label using "adv." without the t at the end.

Have you seen this format?

Forum discussion at Twitter.