Specialized badges awarded in various series and levels for demonstrating skills appropriate to the soldiers military specialty.
They came in three series;
1st series, 1958-1967
2nd series, 1963-1985
3rd series, 1986-1990
2nd Series Panzer, I have 1st and 3rd Class badges.
Here's the placement of the 3rd Class Panzer. The jacket is dated 1981, the shoulder boards, collar tabs, sports award and Classification Badge are all appropriate to the jackets date.