LBBG female 6cy Holland 5.330.587, May 13 2002, Missouriweg, Maasvlakte, the Netherlands (51.59N,04.02E). 

An new Dutch aluminum ring: Ringstation Arnhem. Ringed June 24 1997, IJmuiden as pullus. The primary tips look slightly worn this adult female. Note the extensive white mirror on p10, merging with the tip. It's often stated that females have smaller mirrors on p10 and often lack the p9 mirror, but the feature of a smaller sized mirror only applies for the average population; single individuals may show severe overlap. Besides the gender differences, there is also a tendency for smaller mirrors in eastern populations (compare UK graellsii with Finnish fuscus).