This is protest print by Paul Peter Piech is opposing Thatcher’s stance on apartheid and Nelson Mandela in particular.

Piech was an extremely moral man, and often ahead of his time with his views on many issues.
 
Probably intended for use in an anti-apartheid march, it wasn't really meant to survive beyond that.
It is therefore marked and creased as you might expect, but an extremely powerful image nonetheless.
 
The frame size is approximately 77cm x 48.5cm.