Hi...
Yup, the finish remains a bit of a mysterie.
I just now sent for a quote on re-chroming the the two pipes (the company is situated close to Aarhus) and I sent a few photos of the bottom cross asking them for advice, since they also do polishing of aluminium amongst many other highly specialized things, so they might have some idea - it's worth a try.
At this point - as there seems to be a lot of guesswork - I lean towards letting my choice of finish for the cross be dictated by the coherence of the look.
In an effort to explore all my options, I'm going to write Struer Museum, because I happen to know (from a reliable source), that they keep a group of old B&O staff in their basement.
Hehe, well thats not quite true - but they have a group of seniors that meet up down there for restaurations of incoming B&O donations from people, to use in their exibition.
Perhaps the museum would pass on a question about the stands to them? At least its worth a try and I if they can't/won't, I will have to bother my reliable source instead, to see if he can help with that ;-)
Jesper...