I just won a auction on a very nice 70s Bob Jackson Merlin: http://www.ebay.com/itm/160658892842...84.m1439.l2649

***EDIT: Seller responded saying it was actually a 58cm top-tube.

63cm seat-tube, which is great. But the 54cm top-tube is something I overlooked and I'm worried now that I won't be able to ride the thing comfortably.