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Obligatory what's that rack question.
Looks like a CETMA 5-rail (maybe with different stays) to me. Edit: Different bike you reacted to, apologies.
Bracket behind the fork crown, would be my guess
Might be (partly) right, I think in front of the fork possibly. You can see some metal bits just behind the v-brake I think. I would imagine that fender not being very sturdy though.
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It's this one, they're highly available in France although not so much in the UK. Can really hold a load as well.
My old polo bike, now city bike: