Herring Gull C527R 2cy (argentatus), August 11 2002, Tampere, Finland (61.31N,23.43E).

A 2cy argentatus, trapped and ringed as 2cy bird orange C527R, today August 11 2002 in Tampere Finland (61.31N,23.43E). A bird with a dark iris and arm-span of 440 mm. 
The complete moult is well underway with most wing-coverts and the inner primaries moulted to second generation. The outermost primary P10 is still juvenile. P1-P7 are fully grown second generation flight-feathers and P8 is already reaching at the length of P6. The primary moult score is 41. The outer secondaries are replaced for second generation feathers: S1-S11 are new, from S12 inwards a small group of secondaries is missing and a few innermost secondaries are still juvenile.
The tertials and most of the wing-coverts are replaced for second generation feathers. The only wing-covert still to be replaced are the lesser coverts, of which feathers are still missing in the carpal edge. All scapulars have been replaced by second generation feathers, including the scapulars in the lowest row.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 wing-coverts (inner greater coverts and 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: