generally frames from that era had the appropriate length seatpost (as in non compact frames) so didn't require anything longer than 250mm. There's a kalloy here for not much which has a look that would work http://www.ebay.co.uk/itm/Seatpost-27-2mm-Kalloy-25mm-layback-35cm-length-/290781843274?pt=UK_sportsleisure_cycling_bikeparts_SR&hash=item43b3f2cf4a
@Mr_Bump started
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generally frames from that era had the appropriate length seatpost (as in non compact frames) so didn't require anything longer than 250mm.
There's a kalloy here for not much which has a look that would work
http://www.ebay.co.uk/itm/Seatpost-27-2mm-Kalloy-25mm-layback-35cm-length-/290781843274?pt=UK_sportsleisure_cycling_bikeparts_SR&hash=item43b3f2cf4a