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Cost just over £20 inc p&p and it's the twin screw system, where as the others I found are single screw...it's a bit nore, but it comes from the UK, I don't have to pay £13 to get here and run the risk of Mr Tax man coming knocking
FYI I also found that Selcof make one and it's available here slightly cheaper single bolt model
OK, OK I know they aren't retro, but I think I'd have more chance finding a chicken's dentist in full time employment, than a decent 26.0mm black seat post from 1989!