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lug pattern is NERVEX ref. 45/159

bottom bracket shell is NERVEX ref. 159
"56" marking likely the frame size in cm

dropouts may have begun life as JUY or Agrati items
gear hanger has been added, stop is in the 4 o'clock position for Huret

crown may be a stock item which has been modified
if it came from the maker with this shape suspect it may be non-european

partially collapsed brake bridge suggests it was made without an internal sleeve to reinforce the mounting hole

pump peg is not the NERVEX ref. 845 item one would expect to see as a companion to the NERVEX lug set and shell

shift lever boss mounted unusually high on down tube

two checks which may advance the exploration would be to a) examine the interior of the head tube for any sign of head emblem fastener holes being filled in and b) remove paint from steerer to see if there are any markings on the tube

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