note 1 : used codes are : number / letter / letter 'X' or 'W' and number / number / letter 'X' or 'W' and 'number / letter 'X' or 'W' / number' and number / letter 'X' or 'W' / letter, without 1XF and 1WF.
Combination of :
* metal ring (on left leg).
* yellow ring with a black two alpha-numeric code (letter/number) over red ring OR blue ring since nov. 2021 OR white ring (since dec. 2023) (on right leg).
note 1 : for the future the colours black (N) and dark-green (G) will be used.