Looking for a bit of advice on a Hercules Tourist tandem bicycle that I just picked up. It appears in all original condition (barn fresh!) overall, with what looks like original finish and paint in remarkably good shape. From the pics, can anyone give me a sense of year, style, etc.? I've seen BSA tandems call this a 'ladyback' model - would that hold true here? Also, the crank is incomplete (rear missing and half of front) - any recommendations on locating an original or something that would at least get me on the road and look period appropriate? I can't wait to get this out on the road and would greatly appreciate the guidance.