(4 images) Larus fuscus fuscus 3cy C1XS, July 11-16 2003, Tampere, Finland (61.33N 24.59E).

C1XS was ringed in Luopio, Finland; ringed as pullus on July 01 2001 by Risto Juvaste.
Recorded at Tampere:
2003-05-21, 2003-05-24, 2003-05-28, 2003-05-29, 2003-05-30, 2003-05-31, 2003-06-05, 2003-06-14, 2003-06-16, 2003-06-18, 2003-06-20, 2003-06-22, 2003-06-28, 2003-07-05, 2003-07-06, 2003-07-11, 2003-07-15, 2003-07-16, 2003-07-20, 2003-07-21, 2003-07-23, 2003-07-24, 2003-07-26, 2003-07-31, 2003-08-02, 2003-08-03, 2003-08-09, 2003-08-12.
After August 02 2003, it wasn't seen again at Tampere dump despite intense visits and may have moved further south from that date on.

Larus fuscus fuscus in 2cy often returns with completely replaced primaries and secondaries. In 3cy, fuscus more often shows a clear division between fresh inner primaries and older outer primaries, the inner primaries often showing neat white tips and the outer primaries often second generation-like with rounded tips and paler bleached brown. The arrested moult in the primaries is often reflected in the secondaries and (to a less extend) in the tail-feathers as well. The older tail-feathers (often R5 is older) still show a broad dark sub-terminal band.
3cy fuscus often have some black markings on the bill, which is otherwise much adult-like, with a clear red gonydeal spot. The colour of the naked parts are adult-like as well. 
The scapulars in 3cy are often completely adult-like, lacking internal patterns; plain blackish grey with a mahogany hue on the older feathers. Most wing-coverts and tertials are adult-like blackish grey as well, but often 3cy birds show some very bleached pale brown wing-coverts, normally in the greater covert bar and in the upper rows of the lesser coverts. These bleached wing-coverts accentuate the jumpy sequence in the last wing-covert moult cycles, as there is often no clear pattern in location of these bleached feathers. Head and body feathers normally are snow-white by July.

C1XS was ringed in Finland, now in 3cy. This 3cy fuscus has arrested the primary moult at P5, leaving a clear division between P5 and P6. The outer primaries are dark brown with only a very small mirror on P10. In the folded tail, the rectrices appear fresh with pretty neat tips and are white without any black markings. However, as the tail is spread, R3 proves to have a broad black sub-terminal band, as can found commonly in early required 3rd generation tail-feathers. Note the dark markings on the bill.