That alloy cottered chainset;
Listing references Caminargent, which are these crazy bolted together aluminium bikes from the 30s.
Gotta love the French.
Pics snapped from my copy of the Competition Bicycle (Jan Heine)
The Caminargent in the pic. appears to have cotterless cranks.
I understand that Caminargent owners today regard their bikes as too fragile to ride on anything but the smoothest surfaces. They are certainly very elegant, but I don't think I'd want to bother with a bike I dare not ride.
Bloody VAT - it's making looking at French ebay a pretty bitter experience!
Re the Magistroni, £150 all-in for nos cranks and chainwheel (a bit on the big side), it's not cheap but it's not awful if that floats your boat.
I saw these the other day and thought of you. I don't know what they are, and I don't have 300 euros for them but I surely do like them https://www.ebay.co.uk/itm/254837898741?ul_noapp=true