Thanks for posting photos, I'm glad that this went to someone on the forum, I would have bid on it but I'm in NSW.
I don't have any information on this scope, this must be one of their first. I do have an archive of all the BWD manuals and photos that are freely available on the net, but not this model!
I didn't have the 881A manual either, so thanks for posting that!
This could be the last surviving 03/F1 left in existence, so look after it!
edit: If you can find an archive of Australian Electronics magazines from the 1950s/1960s there could be adverts/specs in there.
edit2: Trimax transformers (used in this scope) changed name in 1963
link, so I guess your scope is
younger older than that!