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@PhilPub
Cheers! You've picked out the one single component that has survived the original build when my brother built the bike for me in 1987, so officially I wouldn't know! But it's a Dura Ace AX, so I'm guessing 27.2, yes.
One other route of enquiry could be a Ron Cooper owners' group on fb, which his son has posted in occasionally. https://www.facebook.com/groups/5780985847/