Finland.

White ring with a black three alpha-numeric code, starting letter 'C' followed by letter/number or number/letter (on left tarsus) and metal ring (on right tarsus).

note 1 :  used codes are : CA0 till CZ9 OR C0A till C9Z. 

note 2 : 

Combination of :
* dark-pink flag with a black three alpha-code (on left tarsus)
* 1 c-ring (on right tibia). 

note 1 : right tarsus : metal ring ; left TIBIA : dark-pink coded flag with three black letters ; right tibia : marker colour ring, could be orange or dark pink or green.

note 2 : used codes consist of three letters, ten different letters used.

note 3 : birds are ringed either on their breeding grounds in Kilpisjärvi in Finnish Lapland (dark pink marker ring) or on migration stop-over/wintering site in Jurmo Bird Observatory in the archipelago in south-western Finland (orange marker ring).

note 4 : http://maps.google.com/maps/ms?ie=UTF&msa=0&msid=218126239832198286264.0...

White ring with a black three alpha code (starting letter 'C' followed by two letters).

note 1 : used codes are CAA ... CZZ.

note 2 :

White ring with a black three alpha-numeric code (starting letter 'C' followed by two numbers).

note 1 : used codes are C00...C99.

note 2 :

White ring with a black two alpha code (on right tarsus).

note 1 :  

Red ring with white 2 alpha code (on one leg) and metal ring (on other leg).

note 1 : up to 2014, a total of 54 rings delivered since 2011.

note 2 :

Yellow ring with black 2 numeric code (on one leg) and metal ring (on other leg).

note 1 : over 200 birds are ringed in Finland since 2006.

note 3 :

White ring with a black two alpha code.

note 1 : up to 2014 total 181 rings delivered since 2013-2014.

note 2 :

Combination of a c-ring over two numeric ring (on left leg) and 3 c-rings (on right leg).

note 1 :

White ring with a black five alpha-numeric code, starting letter 'C'.

note 1 :