Lesser Black-backed Gull RJ5 7cy, April 19 2003, Nachtegalenkeet - Maasvlakte, the Netherlands (51.59N,04.02E). 

An adult ringed, left orange with a white code RJ5. Ringed as pullus at the same location, July 11 1997. Note the medium mirror on P10 and the neat rather small white tips. There is no black on the bill and the red gonydeal spot extends on the upper mandible. The wing-coverts and tertails show a combination of older, brown hued feathers and fresh plain grey feathers.

RJ5 in the centre.