Is it a French tandem 28mm headset, rather than a MTB 1 1/8” headset?
https://www.veloduo.co.uk/blogs/news/updating-maintaining-peugeot-tandem-part-1-headset
Could well be, need to measure it up again, been a while since I last thought about it. Have a french touring tandem in as well, not as nice a 'Le Jeune' in 70's mettalic brown, for sale if anyone wants a project!
@LWaB started
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Is it a French tandem 28mm headset, rather than a MTB 1 1/8” headset?
https://www.veloduo.co.uk/blogs/news/updating-maintaining-peugeot-tandem-part-1-headset