I'm curious, so after reading Byron's story and the name of the ship he has mentioned as "Sedlitz" what made you look at a ship named "Seydlitz"?
A friend of mine mentioned the same thing, given my research I have not found any shipping documents at present regarding the ship "Sedlitz" other that a london newspaper archive, I also have had email correspondence with German Maritime archives stating that just prior to and during the war alot of documents were either hidden or destroyed in fear of the Nazi's.
Searching shipping records in Germany and here in Australia, i have managed to accumulate shipping documents on the ship "Seydlitz" that correspond between the German manifest with the Australian Manifests, I also have detailed Passenger lists.
The only thing with all the documents i do have is the ship "Seydlitz" never arriving or departing Sydney prior the war in 1914, this make it difficult to assume this ship "Seydlitz" being the ship in question, having said that the evidence swaying towards the ship named "Sedlitz" is becoming more compelling as being the correct ship. Byron was a researcher, he wouldn't just make up a bogus ship, and London newspapers wouldn't just invent a ship nor would the Australian newspapers at the time.
Question remains, why are the records of this ship "Sedlitz" kept a secret.
Good collection you have, let discuss more on this topic! Treasure Hunting is never boring!
regards