Herring Gull 5.365.084 2cy (argenteus), November 16 2002, Westkapelle, the Netherlands (51.33N 03.25E). 

The complete moult in argenteus is finished by October and overlaps with the partial autumn moult which starts in September and often include scapulars, a few inner wing-coverts and upper tertials. The head shows neat fine streaking and the under-parts and rump are pale, mottled with brown. The scapulars and mantle are replaced for third generation feathers, finishing with the replacement of the rear lowest scapulars. The pattern of these third generation scapulars is more or less similar to the anchor pattern of the second generation feathers. Simultaneous with replacement of the lowest scapulars, argenteus moult some of the lower upper scapulars in November. By October, argenteus the new scapulars may appear adult-like pale grey or grey-based. 

By November, argenteus has finished the primary moult. The second generation tail-feathers show a clear-cut blackish tail-band with only isolated blackish markings on the white basal half.

By early October, argenteus finish the complete moult, with the central greater coverts and outer lesser coverts moulted last. Between September and November, the average 2cy argenteus start a simultaneous partial autumn moult in the wing-coverts, including the upper tertials, some median and lower lesser coverts and often the inner greater coverts.

This Dutch 2cy argenteus was ringed as pullus by Roland-Jan Buijs, at the industrial emplacement "Vlissingen-Oost / Quarleshaven" in the SW of the Netherlands on June 30 2001. It has P10 fully grown and is illustrative for argenteus, replacing wing-coverts in the partial moult: only two greater coverts (#2-3) moulted, with all other coverts and tertials still old second generation. Note the yellow-brown iris.