Call me Autistic but I don't care. Ever since I was young I had an interest of seeing ok graffiti and knowing when it was made. My oldest I seeing a peice from 86 last year behind a cash converters store where a abandoned parking lot was present. It was faded and I could see the year placed next it. (It was shut off to the public but I still jumped the fence).
'mid ninetys maybe. never spotted a piece from the 80s. I would ask local ogs what they know about it. sometimes dates are innacurate or not even a date.
There's a piece in a park by mine, I'll take a pic. It's dated 99. It's faded away and shit but it's still there.