Opel cars have always been inviting people to take a closer look. Many of them have become beloved classics. From timeless design highlights to nearly-forgotten beauties, one man knows them all: Jens Cooper, an expert at the Opel Classic Europe workshop. He’s put together a list of particularly striking, noteworthy, and nitpicky little details for Opel Post. Cooper is challenging our readers to prove whether they’re also true Opel experts: Who among you can tell which Opel vehicles the following design highlights belong to?