Well what a great story, dan There are at least three types of zinc Assmann Observers, each having different wreath styles and reverse set-ups. Assmann are well known for using their earlier dies (originally used for tombak/aluminium badges) in the manufacture of their late zinc series. Early zinc examples will be found with a thin, well detailed wreath and hinge attached by means of a hinge plate. The second type, and a little later in the proceedings, has the heavier, slightly less detailed wreath with a one-piece sheet metal hinge, and the last in the series will be found with a one piece wreath/cast-in hinge. Going on the marks left by the hinge/catch, I would say that your badge is the # 2 type with sheet metal hinge. Even though the badge has seen better days, it?s absolutely right for a late zincker and still a nice piece of history. As far as restoration goes? leave it as you found it.