Yellow ring with a black three alpha-numeric code (number / letter / letter or number / letter / number or number / number / letter) ... with the number 90° turned on the letters (on right leg) and metal ring (on left leg).
note 1 : for the two letters, these series are never used HV, MH, MV, NH, NV, NW, VH, VN, VV, VW, WA, WH, WN, WV, WW, XH, XM, XN, XV, XW.
note 2 : used numbers are : 0, 1, and 2. To be used are : number series 3, 4, 5 , 6 , 7, 8, 9.
note 3 :