Gran Sport  compared to Valentino front derailleur
 
Photo and chart courtesy Amir Avitzur & VeloRetro timeline

  Gran Sport Valentino
Cage to Push Rod Bolt one on top one in front
Body   flat around exit of rod  reinforced around exit of
Push Rod Diameter    larger
Cage Hole for Push Rod   larger
Cage  Chromed  dull finish
  bolted together riveted
Interchangeability Not   Not
Year of Production   1951 (cat #12) until? 1964 same as
Record (cat #15)
Market All models economy level

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