Left to right: MIVA UNES 1212 (1st series with big letters embossing), MIVA UNES 1212 in very light green, and MIVA 1212 R (different top groove). The number 1212 indicates a 1 (Unipart) 2 (nr. of shells ) 12 (exercise voltage). To the same family belong the 1205 (all versions) and bigger 1215.