The first keys- more images Keys from the time of the Roman Republic and Empire. The Saalburg fort museum north of Frankfurt in southwestern Germany. Photo by author. Turning bronze key and iron Turning bronze key Key for a pin tumbler lock with a lion-shaped shaft of bronze and iron. Sketches by the author. Bronze keys for pin tumbler locks. Hanns Schell Collection, Graz. Photo by the author. Bronze keys for pin tumbler locks. Hanns Schell Collection, Graz. Photo by the author. Bronze keys for pin tumbler locks and turnkey locks. Hanns Schell Collection, Graz. Photo by the author. Bronze keys for pin tumbler locks. Hanns Schell Collection, Graz. Photo by the author. Bronze keys for pin tumbler locks. Hanns Schell Collection, Graz. Photo by the author. Bronze keys for turnkey locks. Hanns Schell Collection, Graz. Photo by the author. Bronze keys for small pin tumbler locks. Hanns Schell Collection, Graz. Photo by the author.