Originally Posted by
repechage
Yes, there were 26.0 "early" Cinelli bars. I have had two, mine were without anodizing. The VAST majority of the "crest" bars are 26.4. But, test, don't guess.
Some claim the knurling for the stem provides identification, measure.
OK, this is starting to make sense. Sounds like an early transitional size. Early to mid 60s was before my time. The bars in the photo appear to be un-anodized, which supports this.
I still remember some old timers complaining about the newfangled alloy bars, long after Cinelli steel was gone.