LEGO 9747 Robotics Invention System, Version 1.5

Released 1999 · 731 pieces · Mindstorms · RCX

• Estimated value: $173 (modelled from piece count, era, and age — not live market data)

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• The 4th largest of 74 Mindstorms sets
• 24¢ per piece — cheaper per piece than most Mindstorms sets

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