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thanks for sharing this encounter
frame -
lug pattern BOCAMA 50/I
seat lug BOCAMA pattern H
crown Vagner pattern DP
shell BOCAMA
dropouts NERVEX Ref. 1036
fork ends NERVEX Ref.1410
curved chainstay bridge NERVEX Ref. 600 serie
dynamo mount bracket NERVEX Ref. 898AR
pump pegs NERVEX REF. 848
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kitting -
chainset: A. Duprat of the type where chainwheel threads onto a boss and is secured by a threaded lockring
example:
View attachment 1001166
LAM brakes of course a product of Ets. Maillard
grips appear to be from FELT
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, I could just make out A. DUPRAT in the flutes on the cranks the ring looks rather interesting as it's normally hidden in the chain case. Think it may have seen Mafac on the lever and has an alloy seat post with round top 
