Finland.

Dark-green ring with a white four alpha-numeric code, starting letter 'C'

note 1 :  up to 2014, a total of 1046 rings were delivered since 1996-2009.

note 2 :

White ring with a black four alpha-numeric code (starting letter "C) on left leg and metal ring (in right leg).

note 1 : used codes are : C00A...C99A , C00E...C99E and C00U...C99U.

note 2 : birds ringed near the city of Vaasa, western Finland.

note 3 : ringer is Jouni Kannonlahti.

note 4 :

Yellow ring with a black three alpha-numeric code (2 letters and 1 number).

note 1 :  

Red ring with a white three alpha-numeric code (2 letters and 1 number).

note 1 :  

Yellow ring with a black three alpha code (on left leg) and metal ring (on right leg).

note 1 : birds ringed since 2012 and 2013.

note 2 : used codes are : Cxx, Fxx, Jxx, Kxx, Lxx or in detail : CKC-FFT and from 2014 onwards : JAA, JAC, ...

note 3 : from 2015 onwards (till 2019) another project is joining this one, f.i. birds ringing in western Finland.

note 4 : up to 2014, a total of 764 rings were delivered since 2012-2014.

note 5 :

Yellow ring with a black two alpha code (on left leg).

note 1 : up to 2014, a total of 305 rings were delivered since 2008-2011.

note 2 :   

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

note 1 : ex. of a code C1A, C1B, ... C2A, C2B ... C9Z.

note 2 :  up 100 rings delivered 2014.

note 3 : 

White ring with a black three alpha-numeric code (letter/number/letter or letter/letter/number) and metal ring (on other leg).

note 1 : used codes are : C1F, C2F, C3F, C4F, CKA, CKC, CKF, CKH, V1M, V1N, V1P, V1R.

note 2 : from 2014 onwards used codes will be Cnn, Cnx, Cxn, Cxx (where n=number and x=letter).

note 3 : up to 2014 total 143 rings delivered 2011.

note 3 :  

White ring with a black 3 alpha-numeric code, starting  letter 'C' and 2 alpha-numerics.

note 1 : up to 2014, a total of 175 rings were delivered since 1999.

note 2 :

Black ring with a white five alpha-numeric code,  starting letter 'C '.

note 1 : up to 2014, a total of 106 rings were delivered since 2000-2005.

note 2 : there can exist small text or check marks (spots) in the code, please, inform them also.

note 3 :