Herring Gull C4K91 2cy (argentatus), August 06 2002, Tampere, Finland (61.31N,23.43E).

A 2cy argentatus, ringed white C4K91 as pullus on June 27, 2001 in Kuopio, Finland. 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-P7 are fully grown second generation flight-feathers. The inner secondaries are still juvenile.
The 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. Almost all scapulars have been replaced by second generation feathers, including the scapulars in the lowest row. 

By August, the warm brown tones of the first moulted 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 table below, the primary moult scores of 2cy August argentatus in Finland can be read: