"Herr Klemens says the big crown ia an old English proofmark and the other is a German proofmark used since 1945"
That doesn't really explain their presence on a Ca 1900 German gun built for sale in the USA (Krupp Bbls). I do not believe VL&D imported their Sauer's via England & it is 45 years too early for the other.
Incidently, though I read no German, if i am decifering right the Krone W (Crown over W??) means the bbl to which it is applied has a choke bore (this is found on both bbls of the Sauer/VL&D Double) & has nothing at all to do with whether it is a drilling.
In short I believe Herr Klemens missed this one.
