Technical Institutution Graduate Badges.

[UQWozza]

The same sort of evolution appears to have occurred in all these types of badges:

T1: 1970s - Made of bronze, 3 parts, hot-baked enamel. Screwback. Made by Monetny Dvor in Moscow.

T2: 1980s - Made of aluminium, 3 parts, hot-baked enamel. Screwback. Made by Monetny Dvor in Moscow.

T3: 6-sided version.

As well as technical professions I believe these were given to firemen (and police?).

Simon

[deValcourt]

And here's the one that surprised me. I had no idea what I had.