1940s Helyett Speciale

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I am looking for information to date this Helyett Speciale bike more precisely.  It might just be late 1930s, but I consider 1940s more likely. The distinguishing features that might help are:

  • The frame number 200163
  • The upper tricolour band round the seat tube has the words Championnat de France, and the lower one the years 1931 – 1932 – 1934 – 1935 – 1936 – 1937
  • The lugs?
  • Reynolds 531 butted main tubes (presumably not available during the war years once stock ran out?)
  • JEX? forks (and stays?) (fragment of decal on fork blade that could be part of a JEX decal)
  • Simplex 3-speed Champion du Monde single roller derailleur
  • Brakes – Helyett-branded but of ?? manufacture; aluminium alloy with quick releases
  • Laroche Pouchois aluminium alloy rims (pour boyaux)

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