Herring Gull C237R 2cy (argentatus), July 10 2003, Tampere, Finland (61.31N, 23.43E).

A 2cy argentatus, ringed orange C237R. The complete moult is well underway with many wing-coverts and the inner primaries moulted to second generation. Primary P7 has been dropped and P8-P10 is still juvenile. P1-P5 are fully grown second generation flight-feathers, P6 at the length of P3, PMS about 30.
Most tertials and the wing-coverts are replaced for second generation feathers. The central greater coverts are missing and one inner greater coverts is still juvenile (probably #4). The new greater coverts grown in descendant order, from the outer-wing inwards, as is the common sequence. The gap in the median covert row is almost closed, with two juvenile feathers still present. Most juvenile wing-coverts can be found in the lesser coverts. 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: