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SLX frames as a rule have seat tubes of 27.2mm.
The seat tube clamp has probably been tightened a bit too much at some point in its life and therefore pulling in the top part of the seat tube by a minute fraction . The seat tube itself would have collected years of gunk/crud /grease over time and of course the difference between the post sizes is tiny.
I had a issue once with a Colnago Master which would not take the correct sized post. After cleaning the seat tube with degreaser and very fine wet & dry, I slightly prised open the seat tube clamp and the post would then fit.
SideshowBob
@mashton
I've been doing a spot of research on Daccordii framea and found this 1987, 50th anniversary brochure.
Although had to find the exact frame same frame in there, you can certainly see all of its features: the paint, the chrome, the lugs, the arched brake bridge, the internal cable routing etc.
One thing that is odd though, is that all of the SLX frames in that brochure, and a previous 1980 one, state a seat tube diameter of 27.2mm and mine is measured at 27.0mm.
Can they shrink? Any thoughts?