This is a SunTour V GT (4900) branded up for Vista by simply changing the embossing on the  outer parallelogram plate.

The date of this derailleur indicates that Vista were possibly own-branding quality SunTour derailleurs even before Schwinn had taken the historic step of own-branding the Shimano Crane as the Schwinn GT300 Le Tour .

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1. •Brand: Vista, manufactured by SunTour
   

2. •My category: SunTour - the V story
   

3. •Country: USA, manufactured in Japan
   

4. •Date of introduction: 1972?
   

5. •Date of this example: unknown (no two letter date code)
   

6. •Model no: unknown
   

7. •Weight: 381g
   

8. •Maximum cog: 34 teeth
   

9. •Total capacity: 36 teeth
   

10. •Pulley centre to centre: 66mm
    

11. •Index compatibility: friction
    

12. •Chain width: 3/32”
    

13. •Logic: top normal
    

14. •Pivots: two pivots, front sprung and rear unsprung
    

15. •Material: aluminium knuckles, steel parallelogram plates and pulley cage plates.
    

0018/A