LBBG E914 7cy, May 12 2001, Missouriweg Maasvlakte, the Netherlands.
Ringed E914 left
orange, probably a female.
Also note the rather slender bill, lacking the clear gonydeal angle, almost Common Gull-like in appearance. This strongly points to a female.
LBBG adultE914, August 18 2001, Missouriweg Maasvlakte, the Netherlands.
P6 shed, p7-p10 are still old.