Here's another example: From a mid 70s Dawes Galaxy, probably a 1977 according to the catalogue posted on bulgier.net. Note that the frame sticker indicates straight gauge 531 (and it has the TI gold bar), but this frame takes a 27.0mm post (supplied by Stacey--thanks!). T-Mar surmised that this frame was mislabeled or reamed out. It is reasonably light--a 25" frame set up as a fixie with 700c wheels, it weighs in at a shade over 21lbs.

Neal