Nick Knight - SKINHEAD
It shows how proud they were of their subculture and how they were part of something that seemed to be of a big importance to them and that it would last forever. It's like a 'uniform' to them, something to show off who they are and brand them.
This is a big comparison to today as subcultures tend to come and go over time. A lot of the time, people are embarrassed to be branded as part of a subculture e.g a Chav wouldn't be seen with 'Chav' tattooed on their forehead as they probably wouldn't admit that they actually were a Chav. Tattoos have always had negative connotations and suggest criminality but they are now becoming more accepted in society.