(3 images) Herring Gull C172N 2cy (argentatus), July 15 & 16 2003, Tampere, Finland (61.31N, 23.43E).

A 2cy argentatus, ringed orange C172N as pullus on June 20 2002 in Kontio, Finland (62.80?N 29.72?E). The complete moult is well underway with most wing-coverts and the inner primaries moulted to second generation. Primary P9 has been dropped and P10 is still juvenile. P1-P6 are fully grown second generation flight-feathers.
Most tertials and the wing-coverts are replaced for second generation feathers. The central greater coverts are still growing: the gap in the greater covert row is almost closed. Last juvenile wing-coverts can be found in the upper lesser covert row. The upper lower scapulars have been replaced recently, probably for third generation feathers, as the scapulars in the lowest row have been moulted before. Again, the fresh scapulars look very second generation like. 

By July, the warm brown tones of the first moulted second generation feathers (inner greater coverts and inner median coverts) are faded to plain white, leaving a contrasting barred pattern on the wing-coverts. On average, 2cy argentatus is more contrastingly patterned than same aged 2cy argenteus, especially regarding the pattern on the central greater coverts. However, some argentatus are distinct "washed out" brown, showing the common vermiculated pattern of 2cy argenteus. 
The last moulted coverts are the central greater coverts and outer lesser coverts, replaced by mid-August. From mid-August onwards, 2cy argentatus start the partial autumn moult, starting again to drop the upper tertial and inner greater and median coverts. 

In the tables below, the primary moult scores of 2cy July argentatus in Finland can be read: