Rob74 wrote: cheap enough Tandem might suit someone. Seems odd. Would ask about the bottom bracket threads.
Rob
I have a soft spot for tandems.
I would be fully expecting both BBs to be standard British threads, given the tension pulley rather than an eccentric, or are you concerned with condition?. I'd prefer a ghost chainring for the purpose of chain tension but that's just me. Of most interest is the Arai drum brake, which can fetch some good money on its own.
Cheers,
Cameron