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Looks like your picture link is broken. Do you mean this?
I may have to take it to the shop. Alternately I could take this website's comment that most lower end french bikes will be 26.2mm . And then if the seat tube is slightly larger (26.4mm) I'll just shim it up with a can from a local Parisian beer for authenticity.
I love the "dynamo is cactus" comment. Looks like a charming beater! Keen to see how it turns out.
Back in the bike shop we used these measuring rods, but that might not be of much use to you:
You could perhaps carry the frame to bike shop - under the thinly veiled pretense of buying some tubes or bargain bin bar tape - and ask to use their measuring tool?