Black octagonal (ELSA) ring with a white 5 alpha-numeric code : letter S, followed by another letter then 3 numbers.
note 1 : produced ring numbers: SA001 - SA999, SE001 – SE999, also SG, SH; SK001-SK999, SL, SM, SN, SP, SR, ST, SU, SW, SZ.
note 2 : Code HES also present on ring is the EURING code for Switzerland.