(metal) colour-ring with a two alpha-numeric code (letter/number).
note 1 : white and yellow are not used.
note 2 : In the massif central red rings (left leg) and (right leg) different colours (black, red and blue according to the departement) ; In the Alps black rings (left leg) are used and (right leg) two different colours according to the departement (green and blue).
note 3 : for the combination black (left leg) and orange (right leg) the contact is :
mylene.herrmann@vanoise-parcnational.fr
note 4 :