Got wound around axel and my Info Ball of String ran over me & I forgot to answer your question. Evidently Sauer W.W. Greener Facile Princeps Actions and in a quid pro quo effort exported Krupp Tube Steel to Greener; being different that the strike in Britain which saw Purdey import Krupp Tube Steel, maybe the Same Sauer Source, when he couldn't get Whitworth. Purdey later offered to replace the ole lower tier Krupp Steel Tubes with Whitworth. But you will find Krupp 3 Ringe tubesets with Kilby fingerprints on them as well as British Proofs.
Hochachtungsvoll,
Raimey
rse
