My guess is that this is in Belgium or Holland in the 1970s. A rather polite looking teacher’s protest, whether school or university teachers I’m not sure. I haven’t had it translated yet and hope someone will see this and help me out!
A nicely composed shot, quickly snapped. The old slide was quite clean and needed little input from me. I corrected color and tone and sharpened it.
Before and after. Click for big.