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You know what, you're right. To be honest I've never had any reason to suspect they were anything other than SL tubes, but comparing mine to regular Pinarello forks (from around '85,) they certainly have a lot more pronounced 'aero' shape, particularly at the crown.
That's kinda cool...I feel a bit stupid that you picked that up just by looking at my crappy photos!
Doesn't seem to be much info about Columbus Air out there, do you know when they stopped making it?
Sure its SL? Do you have a picture that shows the rear of the fork crown?