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mattyc
@greeno
Sorry for bombardment of posts.
Maybe post a pic of the whole frame, see if anyone recognises the model and can confirm the diameter.
Sheldon only has two Ciocc models listed - both 27.2:
Ciöcc Designer 1984 27.2 Columbus SL
Ciöcc Mockba '80 1984 27.2
https://www.sheldonbrown.com/seatpost-sizes.html