There's old school, and there's old school. These bikes are definitely from the old school. Mike de Wit visited the 30 years SE/DC exhibition and shot some more photos for us to enjoy.
Take this Redline for instance. Kids wanted to be like motocross riders and wanted their bike to look the same. Buddy seat, crossbar, high fender, shocks, the works. There's a sidehack and a Roger de Coster
model in today's gallery too.