And while researching Williams C34 chainrings I found this from 2017:
https://forum.cyclinguk.org/viewtopic.php?t=113981
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I have a '54 Claud New All Rounder with a single d/t shifter braze on.
My double setup is a Cyclo-Benelux Tourist rear mech, Simplex clanger
aka rod operated front mech. Stronglight 49d with new 48/34 TA chain rings.
BB is a Stronglight.
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So that's somebody shifting 48/34 on the front with a Simplex rod FD
And another 'vote' for Cyclo Benelux Tourist.