Columbus Acciaio Speciale Frameset Identification

[cipolinni]

Hi

Recently aquired this rather nice steel Columbus Acciaio Speciale Frameset
Some nice Campagnolo bits etc
Anyone have any ideas on the frame!!
Please see attached photos
Any considerations or comments greatly received

 

[cipolinni]

Re:

Photos

 

[cipolinni]

Re:

Frame number incase
11564UO
Seat post diameter 26.2mm

 

[Midlife]

Gear cable stop near the dropout always makes me think French...