Joined: Sep 2005
Posts: 2,998
Likes: 302
From: Hervey Bay, Qld, Australia.
Bikes: Colnago (82, 85, 89, 90, 91, 96, 03), 85 Cinelli, 90 Rossin, 83 Alan, 82 Bianchi, 78 Fountain, 2 x Pinarello, Malvern Star (37), Hillman (70's), 80's Beretto Lo-Pro Track, 80's Kenevans Lo-Pro, Columbus Max (95), DeGrandi (80's) Track.
This on is a hard one. Personally I have no clue to it's origin although someone may be able to identify the serial number. You say the rear gear cable fan through guides on the bottom bracket. That and the relaxed geometry suggest to me that it's probably a 1970's frame or there abouts. Normally I would not agree with a bike loosing it's original persona but seeing that it's already happened and to is probably a quality frame, I agree that it would make a wonderful fixed wheel bike.
I don't think an identification is possible but then again, there are some pretty well informed members of this forum.