Larus marinus? NW Italy

[alex]

Hello,

this is the invidual i've already seen a few days ago, and of which I posted some pics. Today it showed again and I was able to make a little better pics.
I noticed that the black tail bar was not clear and neat like the other michahellis, but blurred and faint.
I think is a GBBG. Can you confirm?

https://www.flickr.com/photos/48743015@ ... otostream/
https://www.flickr.com/photos/48743015@ ... otostream/

Thanks
Alex