I have a 5.6 210 Caltar S II lense with a No. 1 Copal shuuter. It is the only l ense I have ever owned which does not have a serial number. Does anywone know a nything about this lense? It looks a lot like a Rodenstock, so I expect they ar e the manufacturer. Does anyone know why it does not have a serial number? The re is no sign it has been removed.