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Oh shoot, you may be right.
I always forget about that size, because most people run it threadless now.Looks like this could be the right adaptor then..
https://www.ebay.co.uk/itm/351290134655
Marins from that era used an 1 1/8" headset, the associated quill stem would have a 25.4mm OD, not 22.2mm.