Lesser Black-backed Gull graellsii ET48 9cy, April 26 2004, EMO - Maasvlakte, the Netherlands (51.59N,04.02E).
An adult ringed, left orange ET48. Ringed as pullus on July 08 1996.
(2 images below) LBBG graellsii ET48 9cy, May 24 2004, EMO - Maasvlakte.