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7 series: 1st: 3 psc, from 28KP 623 to 28KP 625. Cassetes type I. 2nd: 7 psc, from 25KP 801 to 25KP 807 Cassetes type I. 3rd: 6 psc, from 26KP 931 to 26KP 936. Cassetes type II (chrome). 4th: 6 psc, from 26KP 1091 to 26KP 1096. Cassetes type II (chrome). 5th: 5 psc, from 26KP 1261 to 28KP 1265. Cassetes type I. 6th: ? psc, from 28KP 1371 to 28KP 1374, mayby more . Cassetes type I. 7th: More than 4 psc, from 28KP 1513. Cassetes type I.