(6 images) LBBG Arnhem 5.257.218, 2002-2003, Missouriweg, Maasvlakte, the Netherlands (51.59N,04.02E). 

LBBG 5.257.218 14cy, May 12 2002, Missouriweg, Maasvlakte, the Netherlands. 

An old Dutch aluminum ring. Ringed July 09 1989, ECT-Maasvlakte as pullus. The primary tips look pretty neat, but the inner wing-coverts and the tertials are very abraded. Moult is completely suspended and there are no moult gaps visible. This ring is almost lost and the inscription is hardly readable. Compare this adult with a bird ringed the same day, 13 years ago! This female was still present on May 31 2002.

(below) LBBG 5.257.218 15cy, June 02 2003, Missouriweg, Maasvlakte, the Netherlands. 

This female again returned to the exact same spot it occupied last year. It has a red orbital ring, a yellow iris without speckling. It has no black on the bill and the red gonydeal spot extends on the upper mandible.
It is most probably a female, judged in direct comparison with its partner and begging for food (code V2). It has 3 pulli on June 02 2003. P10 has a large mirror and the complete moult hasn't started yet: P1 is still present by June 02 2003.