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The designer and test riders are on here (in this thread) I believe... I commented on the photos of the prototype suggesting that it needed a replaceable rear mech hanger and was rewarded with some free Gazelle caps - my small claim to fame...
this though - ooft - https://www.biciclettavintage.com/product-page/gazelle-champion-mondial-aa-special-731-os
And this... https://www.biciclettavintage.com/product-page/gazelle-champion-mondial-team-skala
That’s why it looks so good!
https://www.biciclettavintage.com/gazelle-champion-mondial
Just stumbled across this, nice bit of information about the 853 version